[release/8.0] Fix `BigInteger.Rotate{Left,Right}` for backport by github-actions[bot] · Pull Request #112992

[release/8.0] Fix `BigInteger.Rotate{Left,Right}` for backport by github-actions[bot] · Pull Request #112992 · dotnet/runtime

added 4 commits

tannergooding changed the base branch from release/8.0 to release/8.0-staging

* Add tests for the shift operator of BigInteger

* Fix the unsigned right shift operator of BigInteger

* avoid stackalloc

* external sign element

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