fix: preserve directory structure in Python coverage artifact upload

When using a glob pattern like 'src/**/coverage.xml', upload-artifact
strips the leading directory structure. This causes the coverage files
to be uploaded without the 'src/' prefix, so when SonarCloud looks for
'src/eventcatalogasyncapiimporter/coverage.xml', the file isn't there.

Fixed by explicitly listing each coverage.xml file path to preserve
the full directory structure.

Author: RossBugginsNHS

.github/workflows/stage-2-test.yaml

@@ -101,7 +101,10 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: python-coverage-reports
-          path: "src/**/coverage.xml"
+          path: |
+            src/asyncapigenerator/coverage.xml
+            src/cloudeventjekylldocs/coverage.xml
+            src/eventcatalogasyncapiimporter/coverage.xml
   test-lint:
     name: "Linting"
     runs-on: ubuntu-latest