test: Added xpath coverage report generation (make test)

This commit introduces xpath coverage test report. It plugs into transport layer of test system and generates .md report.
Commit also introduces "make xpath-coverage-report" used to generate pdf out of md.

Resolves: #581
Signed-off-by: Ejub Sabic <ejub1946@outlook.com>

.github/workflows/test.yml

@@ -143,3 +143,15 @@ jobs:
         with:
           name: test-report
           path: output/images/test-report.pdf
+
+      - name: Generate XPath Coverage Report for ${{ env.TARGET }}
+        if: always()
+        run: |
+          make test-dir="$(pwd)/$TEST_PATH" xpath-coverage-report
+
+      - name: Upload XPath Coverage Report as Artifact
+        if: always()
+        uses: actions/upload-artifact@v7
+        with:
+          name: xpath-coverage-report
+          path: output/images/xpath-coverage-report.pdf