PBM add codecov flag for unittests

Author: olexandr-havryliak

.github/workflows/reviewdog.yml

@@ -16,6 +16,7 @@ jobs:
         uses: codecov/codecov-action@v4
         with:
           file: cover.out
+          flags: unittests
           fail_ci_if_error: false
           token: ${{ secrets.CODECOV_TOKEN }}