Get CI coverage signal for both Python and C++

[iseeyuan]

🚀 The feature, motivation and pitch

Use tools to build the code testing coverage for both Python and C++ codes, to track and maintain the code quality.

Alternatives

@kirklandsign : sh test/run_oss_cpp_tests.sh should generate it. However, I didn't see the corresponding logs in GH
@digantdesai : We can do similar to -fprofile with pytest conv for python files, parse it and report it.

Additional context

No response

RFC (Optional)

No response