Add ci: generate test report + code coverage

Combined MR: Add ci generate code coverage !43 (closed)

Last successful generate artifacts: https://ci.eclipse.org/openpass/job/GtGenCore/job/MR-44/3/artifact/

1. Code Coverage https://ci.eclipse.org/openpass/job/GtGenCore/job/MR-44/3/artifact/artifacts/_site/bazel-coverage/index.html

2. Test report : https://ci.eclipse.org/openpass/job/GtGenCore/job/MR-44/3/artifact/artifacts/_site/test_results.html