[release/9.0.1xx] Publish prebuilt reports for each repo

[Winniexu01]

Related to #43336

Fixes dotnet/source-build#4160

Store the prebuilt files for each repo as pipeline artifacts rather than the overall build's prebuilt report, which will make investigations of prebuilt go more quickly.

I introduced a new property DotNetBuildPrebuiltReportDir which point to artifacts\prebuilt-report\<reponame>\, all repo's prebuilt reports will respect this property and move to that folder.

[mthalman]

@Winniexu01 - Can you explain why this is implemented differently from #43336? For example, this PR has changes to vmr-build.yml while the other did not. Additionally, this one defines PrebuiltReportsDir in the targets file while the other defines it in the props file. They should be as similar as possible between the two branches to ease the burden of backporting future updates.

[Winniexu01]

@Winniexu01 - Can you explain why this is implemented differently from #43336? For example, this PR has changes to vmr-build.yml while the other did not. Additionally, this one defines PrebuiltReportsDir in the targets file while the other defines it in the props file. They should be as similar as possible between the two branches to ease the burden of backporting future updates.

Hi @mthalman, I did not do that before because the directory structure in main is changed that all files are stored under \artifacts but in 9.0, the logs for each repo are stored saved under \src\<repo>\artifacts. So I followed the old directory structure to store the prebuilt files to \src\<repo>\artifacts for 9.0. I will update the code .