Fix BCR presubmit pipeline

[UebelAndre]

Hopefully this resolves the following: https://buildkite.com/bazel/bcr-presubmit/builds/9302#0193b38a-65b5-4be1-91b6-138d4ab9cc90

ERROR: The test module directory does not exist in the source archive: /Users/buildkite/builds/bk-macos-arm64-0n05/bazel-org-repo-root/output/extensions/bindgen/extensions/bindgen
Traceback (most recent call last):
  File "/Users/buildkite/builds/bk-macos-arm64-0n05/bazel/bcr-presubmit/bcr_presubmit.py", line 537, in <module>
    sys.exit(main())
             ^^^^^^
  File "/Users/buildkite/builds/bk-macos-arm64-0n05/bazel/bcr-presubmit/bcr_presubmit.py", line 528, in main
    repo_location, config_file = prepare_test_module_repo(args.module_name, args.module_version, args.overwrite_bazel_version)
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildkite/builds/bk-macos-arm64-0n05/bazel/bcr-presubmit/bcr_presubmit.py", line 269, in prepare_test_module_repo
    error("The test module directory does not exist in the source archive: %s" % test_module_root)
  File "/Users/buildkite/builds/bk-macos-arm64-0n05/bazel/bcr-presubmit/bcr_presubmit.py", line 58, in error
    raise BcrPipelineException("BCR Presubmit failed!")
BcrPipelineException: BCR Presubmit failed!
🚨 Error: The command exited with status 1
^^^ +++

My assumption is that module_path is an extension of where the presubmit yaml exists relative to the root one. So this should finally enable CI to run in th eright place with the correct dependency.

[illicitonion]

🤞