ci(github): add standard release workflows

[ncipollina]

Summary

Fixes the post-merge package build failure and brings this repo in line with the standard LayeredCraft workflow set. The old Build workflow used package-build.yaml@v10.2, which runs legacy dotnet test --no-restore and fails for this repo's Microsoft Testing Platform test project on the .NET 10 SDK.

Changes

• Switches PR build to the newest MTP-compatible PR template: LayeredCraft/devops-templates/.github/workflows/pr-build.yaml@v6.4.
• Keeps useMtpRunner: true and testDirectory: "test" for MTP test execution.
• Removes the old .github/workflows/build.yaml workflow.
• Adds the standard LayeredCraft release workflow set:
  • .github/release-drafter.yml
  • .github/workflows/pr-title-check.yaml
  • .github/workflows/publish-preview.yaml
  • .github/workflows/publish-release.yaml
  • .github/workflows/release-drafter.yaml
• Keeps tests enabled in the publish workflows.
• Adds the new workflow/config files to the .slnx under /git/.

Validation

• Confirmed the failed main build errored in the old package build Test Code step with Testing with VSTest target is no longer supported by Microsoft.Testing.Platform on .NET 10 SDK and later.
• Confirmed pr-build.yaml@v6.4 supports MTP by discovering test projects and running them with dotnet run --project.

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