ci: improve PR deployment workflow and labeling (#3842)

# Description of Changes

- Updated the labeler rules in `.github/labeler-config-srvaroa.yml` to
support optional scope (e.g., `feat(api):`) for all conventional commit
prefixes.
- Added broader matching for API-related PRs by including `swagger` and
`api` keywords in title matching.
- Introduced a new `pr-deployed` label in `.github/labels.yml` to
indicate that a PR has been deployed to a test environment.
- Enhanced the `PR-Demo-Comment-with-react.yml` workflow:
- Replaced `create-github-app-token` with a local `setup-bot` action to
standardize GitHub App auth.
  - Added logic to automatically label deployed PRs with `pr-deployed`.
  - Added cleanup logic for temporary files after workflow execution.
- Improved the `PR-Demo-cleanup.yml` workflow:
- Triggered now on `pull_request_target` instead of `pull_request` for
better permission context.
- Automatically removes the `pr-deployed` label and any bot-generated
deployment comment when a PR is closed.
  - Added proper GitHub App auth handling via `setup-bot`.
- Ensured conditional cleanup only occurs if relevant artifacts are
present.

try:
https://github.com/Stirling-Tools/Stirling-PDF/security/code-scanning/240

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] 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)
- [x] I have performed a self-review of my own code
- [x] 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/labels.yml

@@ -175,3 +175,6 @@
   description: "This PR changes 1000+ lines ignoring generated files."
 - name: "to research"
   color: "FBCA04"
+- name: "pr-deployed"
+  color: "00FF00"
+  description: "Pull request has been deployed to a test environment"