only check for source files in src/ and test/ for bazel build

[kilograham]

cc @armandomontanez

[will-v-pi]

This doesn't fix the issue you're seeing in #2921 - you also need to change git_ls_files_by_extension to only return files in these paths.

Also, it's not just files under src and test that should be checked, it should also check tools/pioasm, so I think excluding cmake is possibly the better option than explicitly specifying paths to search?

A fix could be to revert this change and just add

bazel_files = [f for f in bazel_files if not f.is_relative_to("cmake")]

before return bazel_files in git_ls_files_by_extension, to exclude the files under cmake