Update sonarqube.yml and removal of gradle keys (#2866)

# Description of Changes

Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

.github/workflows/sync_files.yml

@@ -104,16 +104,6 @@ jobs:
           git add README.md
           git diff --staged --quiet || git commit -m ":memo: Sync README.md" || echo "no changes"
 
-      - name: Generate verification metadata with signatures and checksums
-        run: |
-          set -e
-          if [ -f ./gradle/verification-metadata.xml ]; then
-            rm ./gradle/verification-metadata.xml
-          fi
-          ./gradlew clean dependencies buildEnvironment spotlessApply --write-verification-metadata sha256 help
-          ./gradlew clean dependencies buildEnvironment spotlessApply --write-verification-metadata sha256,pgp --refresh-keys --export-keys --refresh-dependencies help
-          ./gradlew clean build
-
       - name: Run git add
         run: |
           git add gradle/verification-keyring.keys