Ensure changes to repo level source-build files are code reviewed by source-build experts

Here is an [example change](https://github.com/dotnet/aspnetcore/pull/48179/files) that should have been reviewed by a source-build expert.  The changes to the SourceBuildPrebuiltBaseline.xml caused prebuilts to be added and weren't caught until internal source-build CI.

Suggestions:

1. Add comments to the repo level source-build files to promote having a source-build expert code review any changes
2. If a repo has a CODEOWNERS file, assign ownership of the repo level source-build files to the source-build team to ensure they get included in code reviews.

Repos with comments only:

 - [x] sourcelink: https://github.com/dotnet/sourcelink/pull/1038
 - [x] arcade: https://github.com/dotnet/arcade/pull/13740
 - [x] command-line-api: https://github.com/dotnet/command-line-api/pull/2204
 - [x] emsdk: https://github.com/dotnet/emsdk/pull/353
 - [x] xliff-tasks: https://github.com/dotnet/xliff-tasks/pull/793
 - [x] cecil: https://github.com/dotnet/cecil/pull/88
 - [x] runtime: https://github.com/dotnet/runtime/pull/87003
 - [x] symreader: https://github.com/dotnet/symreader/pull/290
 - [x] xdt: https://github.com/dotnet/xdt/pull/516
 - [x] msbuild: https://github.com/dotnet/msbuild/pull/8824
 - [x] aspnetcore: https://github.com/dotnet/aspnetcore/pull/48566
 - [x] deployment-tools: https://github.com/dotnet/deployment-tools/pull/279
 - [x] templating: https://github.com/dotnet/templating/pull/6660
 - [x] nuget-client: https://github.com/NuGet/NuGet.Client/pull/5196
 - [x] test-templates: https://github.com/dotnet/test-templates/pull/305
 - [x] sdk: https://github.com/dotnet/sdk/pull/32966

Repos with both the comments and `CODEOWNERS` entry:
 - [x] source-build-reference-packages: https://github.com/dotnet/source-build-reference-packages/pull/690
 - [x] source-build-externals: https://github.com/dotnet/source-build-externals/pull/153
 - [x] diagnostics: https://github.com/dotnet/diagnostics/pull/3934
 - [x] razor: https://github.com/dotnet/razor/pull/8787
 - [x] roslyn: https://github.com/dotnet/roslyn/pull/68409
 - [x] roslyn-analyzers: https://github.com/dotnet/roslyn-analyzers/pull/6666
 - [x] format: https://github.com/dotnet/format/pull/1869
 - [x] fsharp: https://github.com/dotnet/fsharp/pull/15288
 - [x] vstest: https://github.com/microsoft/vstest/pull/4503
 - [x] instaler: https://github.com/dotnet/installer/pull/16550


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Ensure changes to repo level source-build files are code reviewed by source-build experts #3435

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Ensure changes to repo level source-build files are code reviewed by source-build experts #3435

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Metadata

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Development

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