refactor GitHub workflow: enhance coverage reporting with verbosity, file checks, and updated paths

Author: allnes

.github/workflows/ubuntu.yml

@@ -388,16 +388,21 @@ jobs:
             --output-dir cov-report \
             --llvm-profdata llvm-profdata-20 \
             --llvm-cov llvm-cov-20
+          # Check if files were generated
+          ls -la coverage.lcov
+          ls -la build/cov-report/
       - name: Upload coverage reports to Codecov
         uses: codecov/[email protected]
         with:
-          files: coverage.lcov
+          files: ./coverage.lcov
+          verbose: true
+          name: llvm-codecov
       - name: Upload coverage report artifact
         id: upload-cov
         uses: actions/upload-artifact@v4
         with:
           name: cov-report
-          path: 'cov-report'
+          path: 'build/cov-report'
       - name: Comment coverage report link
         # TODO: Support PRs from forks and handle cases with insufficient write permissions
         continue-on-error: true