[release/8.0-rc1] Fix PortableRuntimeIdentifierGraph.json not found during runtime repo source build #90714
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Backport of #90695 to release/8.0-rc1
/cc @elinor-fung
Fixes dotnet/source-build#3592
Customer Impact
Source build fails in the stage 2 bootstrapping scenario
Testing
CI build (internal)
Risk
Low