[release/8.0] Use RuntimeIdentifierGraphPath if available in runtime copy of Microsoft.NET.CrossGen.targets #91090
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Backport of #91077 to release/8.0
Fixes #90977
/cc @elinor-fung
Customer Impact
This is a non-shipping target used by the runtime repo.
The sdk (shipping) version of this target was updated to use the new trimmed graph as part of dotnet/sdk#34279. This makes the equivalent change here such that it uses the
RuntimeIdentifierGraphPathif set (SDK always sets starting with .NET 8 RC1), otherwiseBundledRuntimeIdentifierGraphFile.Testing
Local and CI build
Risk
Low