Resolve nullable warnings

[teesofttech]

Summary

• Add explicit nullability/defaults to SDK request and response models
• Align JSON mapping behavior with optional Tableau response fields
• Enable TreatWarningsAsErrors for the core TableauSharp package
• Add regression tests for missing optional project, user, and view fields

Closes #27

Verification

• dotnet build TableauSharp.sln -c Release --no-restore
• dotnet test TableauSharp.sln -c Release
• dotnet pack src/TableauSharp/TableauSharp.csproj -c Release --no-build -p:ContinuousIntegrationBuild=true -p:PackageVersion=0.1.0-alpha.2 -o ./artifacts

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 84fbe7c2-330d-445d-b887-0ad76f40df12

📥 Commits

Reviewing files that changed from the base of the PR and between 20a91b2 and d34467d.

📒 Files selected for processing (29)

• src/TableauSharp/Common/Models/ErrorResponse.cs
• src/TableauSharp/Embedding/Models/TrustedTicketRequest.cs
• src/TableauSharp/Embedding/Models/TrustedTicketResponse.cs
• src/TableauSharp/Embedding/Services/EmbeddingService.cs
• src/TableauSharp/Permissions/Models/PermissionCapabilityAssignment.cs
• src/TableauSharp/Permissions/Models/PermissionSyncRequest.cs
• src/TableauSharp/Permissions/Models/TableauPermission.cs
• src/TableauSharp/Projects/Models/ProjectCreateRequest.cs
• src/TableauSharp/Projects/Models/ProjectUpdateRequest.cs
• src/TableauSharp/Projects/Models/TableauProject.cs
• src/TableauSharp/Projects/Services/ProjectService.cs
• src/TableauSharp/TableauSharp.csproj
• src/TableauSharp/Users/Models/GroupCreateRequest.cs
• src/TableauSharp/Users/Models/TableauGroup.cs
• src/TableauSharp/Users/Models/TableauUser.cs
• src/TableauSharp/Users/Models/UserCreateRequest.cs
• src/TableauSharp/Users/Models/UserUpdateRequest.cs
• src/TableauSharp/Users/Services/GroupService.cs
• src/TableauSharp/Users/Services/UserService.cs
• src/TableauSharp/Workbooks/Models/ExportRequest.cs
• src/TableauSharp/Workbooks/Models/ExportResponse.cs
• src/TableauSharp/Workbooks/Models/TableauView.cs
• src/TableauSharp/Workbooks/Models/TableauWorkbook.cs
• src/TableauSharp/Workbooks/Models/WorkbookPublishRequest.cs
• src/TableauSharp/Workbooks/Services/ViewService.cs
• src/TableauSharp/Workbooks/Services/WorkbookService.cs
• test/TableauSharp.Tests/Projects/ProjectServiceTests.cs
• test/TableauSharp.Tests/Users/UserServiceTests.cs
• test/TableauSharp.Tests/Workbooks/ViewServiceTests.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/resolve-nullable-warnings

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