Fix coverage.xml generation by calling PHPUnit directly

The 'composer test -- --coverage-clover=...' wasn't passing the arguments correctly to PHPUnit, causing coverage.xml not to be generated.

Changed to call vendor/bin/phpunit directly with all required flags including --dont-report-useless-tests from the composer script.

Author: aristath

.github/workflows/code-coverage.yml

@@ -65,7 +65,7 @@ jobs:
 
       - name: Generate code coverage report for current branch
         run: |
-          composer test -- --coverage-clover=${{ github.workspace }}/coverage.xml --coverage-text | tee coverage-output.txt
+          vendor/bin/phpunit --dont-report-useless-tests --coverage-clover=${{ github.workspace }}/coverage.xml --coverage-text | tee coverage-output.txt
         continue-on-error: false
 
       - name: Upload coverage to Codecov