Show preview version on welcome screen

[Mike Krüger (mkrueger)]

Summary

• display a prominent PREVIEW VERSION banner on the welcome screen
• inject the assembly display version at runtime, matching the version command and omitting build metadata
• clarify that commands, output, and behavior may change before general availability
• add regression coverage for placeholder replacement and displayed version

Validation

• dotnet test CosmosDBShell.Tests/CosmosDBShell.Tests.csproj --filter FullyQualifiedName~CosmosShell.Tests.CommandTests.WelcomeCommandTests (5 passed)
• dotnet build CosmosDBShell/CosmosDBShell.csproj --no-restore
• dotnet build CosmosDBShell.Tests/CosmosDBShell.Tests.csproj --no-restore

[Copilot]

Pull request overview

Adds a prominent “PREVIEW VERSION” banner to the embedded welcome screen and fills in the runtime display version (consistent with the shell’s display-version contract that strips build metadata), with regression tests to ensure the placeholder is replaced.

Changes:

• Updated the ANSI welcome screen resource to include a preview banner with a {{VERSION}} placeholder.
• Replaced the version placeholder at load-time using ShellInterpreter.GetDisplayVersion(...) when reading the embedded resource.
• Added regression assertions to verify the displayed version is present and the placeholder is not.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
CosmosDBShell/cosmos_welcome.ans	Adds the PREVIEW banner line and {{VERSION}} placeholder to the welcome screen.
CosmosDBShell/Azure.Data.Cosmos.Shell.Core/WelcomeScreen.cs	Replaces {{VERSION}} at runtime when loading the embedded ANSI resource.
CosmosDBShell.Tests/CommandTests/WelcomeCommandTests.cs	Adds tests to validate version substitution and ensure the placeholder is removed.

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[github-code-quality]

Code Coverage Overview

Languages: C#

C# / code-coverage/dotnet

The overall line coverage in commit ee8fa0d in the dev/mkrueger/welcome... branch remains at 61%, unchanged from commit 48b107c in the main branch.