release/8.0 branch doesn't build with .NET 8 RC1

Trying to build the `release/8.0` branch in various configurations using .NET 8 RC1 leads to the following different errors on macOS:

* Mono builds:
```console
% ./build.sh mono -c Release
...
/usr/local/share/dotnet/sdk/8.0.100-rc.1.23463.5/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(90,5): error NETSDK1212: IsTrimmable is not supported for the target framework. Consider multi-targeting to a supported framework to enable trimming, and set IsTrimmable only for the supported frameworks. For example: [/Users/alklig/work/dotnet-runtime/runtime-net8/Build.proj]
/usr/local/share/dotnet/sdk/8.0.100-rc.1.23463.5/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(90,5): error NETSDK1212: <IsTrimmable Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">true</IsTrimmable> [/Users/alklig/work/dotnet-runtime/runtime-net8/Build.proj]
```
* CoreCLR:
```console
% ./build.sh clr -c Release
/usr/local/share/dotnet/sdk/8.0.100-rc.1.23463.5/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(90,5): error NETSDK1212: IsTrimmable is not supported for the target framework. Consider multi-targeting to a supported framework to enable trimming, and set IsTrimmable only for the supported frameworks. For example: [/Users/alklig/work/dotnet-runtime/runtime-net8/Build.proj]
/usr/local/share/dotnet/sdk/8.0.100-rc.1.23463.5/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(90,5): error NETSDK1212: <IsTrimmable Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">true</IsTrimmable> [/Users/alklig/work/dotnet-runtime/runtime-net8/Build.proj]
/usr/local/share/dotnet/sdk/8.0.100-rc.1.23463.5/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(90,5): error NETSDK1212: IsTrimmable is not supported for the target framework. Consider multi-targeting to a supported framework to enable trimming, and set IsTrimmable only for the supported frameworks. For example: [/Users/alklig/work/dotnet-runtime/runtime-net8/Build.proj]
/usr/local/share/dotnet/sdk/8.0.100-rc.1.23463.5/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(90,5): error NETSDK1212: <IsTrimmable Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">true</IsTrimmable> [/Users/alklig/work/dotnet-runtime/runtime-net8/Build.proj]
```


Libraries builds (`./build.sh libs -c Release`) seem to work.

---

Dotnet info

```console
% dotnet --info

.NET SDK:
 Version:   8.0.100-rc.1.23463.5
 Commit:    e7f4de8816

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  13.6
 OS Platform: Darwin
 RID:         osx-arm64
 Base Path:   /usr/local/share/dotnet/sdk/8.0.100-rc.1.23463.5/

.NET workloads installed:
 [ios]
   Installation Source: SDK 8.0.100-rc.1
   Manifest Version:    16.4.8825-net8-rc1/8.0.100-rc.1
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/8.0.100-rc.1/microsoft.net.sdk.ios/WorkloadManifest.json
   Install Type:        FileBased


Host:
  Version:      8.0.0-rc.1.23419.4
  Architecture: arm64
  Commit:       92959931a3
  RID:          osx-arm64

.NET SDKs installed:
  6.0.404 [/usr/local/share/dotnet/sdk]
  6.0.406 [/usr/local/share/dotnet/sdk]
  6.0.412 [/usr/local/share/dotnet/sdk]
  7.0.100 [/usr/local/share/dotnet/sdk]
  7.0.102 [/usr/local/share/dotnet/sdk]
  7.0.201 [/usr/local/share/dotnet/sdk]
  7.0.306 [/usr/local/share/dotnet/sdk]
  7.0.400 [/usr/local/share/dotnet/sdk]
  8.0.100-preview.1.23115.2 [/usr/local/share/dotnet/sdk]
  8.0.100-preview.2.23157.25 [/usr/local/share/dotnet/sdk]
  8.0.100-preview.3.23178.7 [/usr/local/share/dotnet/sdk]
  8.0.100-preview.4.23260.5 [/usr/local/share/dotnet/sdk]
  8.0.100-preview.5.23303.2 [/usr/local/share/dotnet/sdk]
  8.0.100-preview.6.23330.14 [/usr/local/share/dotnet/sdk]
  8.0.100-preview.7.23376.3 [/usr/local/share/dotnet/sdk]
  8.0.100-rc.1.23455.8 [/usr/local/share/dotnet/sdk]
  8.0.100-rc.1.23463.5 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.12 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.14 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.20 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.3 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.9 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.10 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-preview.1.23112.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-preview.2.23153.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-preview.3.23177.8 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-preview.4.23260.4 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-preview.5.23302.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-preview.6.23329.11 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-preview.7.23375.9 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.0-rc.1.23421.29 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.12 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.14 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.20 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.2 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.3 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.9 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.10 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-preview.1.23110.8 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-preview.2.23128.3 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-preview.3.23174.8 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-preview.4.23259.5 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-preview.5.23280.8 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-preview.7.23375.6 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.0-rc.1.23419.4 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
  None

Environment variables:
  Not set

global.json file:
  /Users/alklig/work/dotnet-runtime/runtime-net8/global.json

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download
```


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release/8.0 branch doesn't build with .NET 8 RC1 #93011

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release/8.0 branch doesn't build with .NET 8 RC1 #93011

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