Duplicate productVersion.txt with repo-specific name

[michellemcdaniel]

In our efforts to unify the build access story using aka.ms links, we have found that there are certain files that share the same name in multiple different repositories, most importantly, productVersion.txt. As part of the work to move to aka.ms links, we will be flattening the short link paths, so rather than having a runtime-specific, aspnetcore-specific, etc. full path to the files generated by each of the repos, they will all go to the same short link location. This means that the path to productVersion.txt will collide in the aka.ms links (the backing locations are not changing and will be unaffected). To combat this, we will add a duplicate of each of the product repos productVersion.txt, renamed to indicate which product repo it came from, in this case runtime-productVersion.txt. The original will remane so that we do not break existing scenarios that do not use the aka.ms links.

Addresses dotnet/arcade#6862.

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[michellemcdaniel]

@stephentoub is the OSX_x64 failure a known failure? I looked through some of the PRs submitted around the same time as mine and saw the same failure, but don't feel comfortable merging on red.

[stephentoub]

is the OSX_x64 failure a known failure?

Probably. What's the failure? (It looks like the pipeline was restarted.)

[michellemcdaniel]

I restarted it to see if it was transient. The original failure was:

/Users/runner/.dotnet/sdk/5.0.102/MSBuild.dll /nologo -maxcpucount /m -verbosity:m /v:minimal /bl:/Users/runner/work/1/s/artifacts/log/Release/ToolsetRestore.binlog /clp:Summary /clp:ErrorsOnly;NoSummary /nr:false /p:TreatWarningsAsErrors=true /p:ContinuousIntegrationBuild=true /p:__ToolsetLocationOutputFile=/Users/runner/work/1/s/artifacts/toolset/6.0.0-beta.21105.5.txt /t:__WriteToolsetLocation /warnaserror /Users/runner/work/1/s/artifacts/toolset/restore.proj
/Users/runner/work/1/s/artifacts/toolset/restore.proj : error : Unable to load the service index for source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json.
/Users/runner/work/1/s/artifacts/toolset/restore.proj : error : Unable to load the service index for source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json.
Build failed with exit code 1. Check errors above.

In Build CoreHost. Given that it has made it past that step, I think it was transient, but will wait for the re run leg to finish.