[grpc] 1.68 Build on Windows produce huge lib files

[magnesj]

When building grpc 1.68 using default settings on Windows produce huge lib files. In the workflow we are using, the lib file is too big to fit into the cache for vcpkg on GitHub Actions. This causes very long build times, as grpc has to build from source on every run.

Here is a listing of file sizes compared to other libraries we build.

Proposed solution

Reduce file size on disk.

Describe alternatives you've considered

No response

Additional context

No response

[JonLiu1993]

@magnesj, Thanks for your issue, The upstream should decide whether to delete so many lib files generated by grpc. I noticed that you have submitted an issue upstream. Let's track it in the issue grpc/grpc#38560.