Remove screenshot test PR comment workflow; replace with inline CI error and retries

.github/workflows/main.yml

@@ -163,6 +163,17 @@ jobs:
       - name: Test with Gradle Wrapper
         run: |
           ./gradlew :jme3-screenshot-tests:jme3-screenshot-tests-desktop:screenshotTest
+      - name: Report Screenshot Test failure
+        if: failure()
+        run: |
+          echo "::error title=Screenshot tests failed::Screenshot tests have failed.%0A%0A"\
+          "To review the differences:%0A"\
+          "  1. Download the 'screenshot-test-report' artifact from this run.%0A"\
+          "  2. Open jme3-screenshot-tests/build/reports/ScreenshotDiffReport.html%0A%0A"\
+          "If you did not intend to change any visuals: fix your changes so the tests pass.%0A"\
+          "If you intended to change visuals: review jme3-screenshot-tests/build/changed-images"\
+          " and commit replacements to jme3-screenshot-tests/src/test/resources.%0A%0A"\
+          "See https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-screenshot-tests/README.md for more information."
       - name: Upload Test Reports
         uses: actions/upload-artifact@v7.0.1
         if: always()