C#: Fix merge conflicts. Unfortunately, the type of `symbolEntityCache` needed to be the same as `objectEntityCache` to fix nullability warnings.
C#: Fix merge conflicts. Unfortunately, the type of `symbolEntityCache` needed to be the same as `objectEntityCache` to fix nullability warnings.

github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql