Split CI test execution by framework using matrix strategy and optimize workflow dependencies

[Copilot]

Split dotnet test execution in CI workflows to run independently across net8.0, net9.0, and net10.0 using GitHub Actions matrix strategy for better visibility into framework-specific failures. Optimized workflow structure to ensure proper job dependencies and eliminate unnecessary builds in PR checks.

Changes

• NetCorePal.SourceGenerator.UnitTests.csproj: Changed from single TargetFramework (net9.0) to multi-targeting TargetFrameworks (net8.0;net9.0;net10.0) to align with other test projects

• .github/workflows/pr.yml:

  • Simplified to only include test job with matrix strategy
  • Removed build job (including docker build) to streamline PR checks
  • Added explicit contents: read permissions to test job

• .github/workflows/dotnet.yml:

  • Restructured into 3 separate jobs: build, test, and pack-and-push
  • Test job runs with matrix strategy across frameworks
  • Pack and Push operations moved to separate pack-and-push job with needs: [build, test] dependency
  • Ensures package creation only happens after both build and all tests pass
  • Removed --settings .runsettings parameter from test commands
  • Added explicit contents: read permissions to test and pack-and-push jobs

Result

PR workflow runs only tests in parallel across all three framework versions for faster feedback.

Preview build workflow ensures proper job ordering:

1. Build and test run independently in parallel
2. Pack and push only execute after both succeed

test:
  strategy:
    matrix:
      framework: [net8.0, net9.0, net10.0]
  steps:
    - run: dotnet test --framework ${{ matrix.framework }}

pack-and-push:
  needs: [build, test]
  steps:
    - run: dotnet pack ...
    - run: dotnet nuget push ...

Original prompt

---

This section details on the original issue you should resolve

<issue_title>拆分test framework</issue_title>
<issue_description>1. 使用matrix 将CI的dotnet test按照 net8.0 、net9.0、 net10.0 分开

2. 修改项目NetCorePal.SourceGenerator.UnitTests.csproj，改为net8.0;net9.0;net10.0</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 拆分test framework #319

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[witskeeper]

@copilot pr.yml 仅保留test即可，不需要build
dotnet.yml 需要test通过后再执行 Pack 和 Push

[Copilot]

@copilot pr.yml 仅保留test即可，不需要build
dotnet.yml 需要test通过后再执行 Pack 和 Push

Done in commit 32ab482:

• pr.yml: Removed build job, only test job remains
• dotnet.yml: Split into build, test, and pack-and-push jobs where pack-and-push depends on both build and test passing via needs: [build, test]