chore: expand GitHub label configuration with size, language, and workflow labels (#3778)

# Description of Changes

Please provide a summary of the changes, including:

- Descriptions were added for several labels to improve automation
compatibility and clarity.
- These enhancements facilitate clearer PR management and allow for
better filtering and automation via GitHub Actions or other tooling.

---

## 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.

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

.github/labels.yml

@@ -137,4 +137,41 @@
   description: "Reverts a previous commit"
 - name: "style"
   color: "FFA500"
-  description: "Changes that do not affect the meaning of the code (formatting, etc.)"
+  description: "Changes that do not affect the meaning of the code (formatting, etc.)"
+- name: "admin"
+  color: "195055"
+- name: "codex"
+  color: "ededed"
+  description: null
+- name: "Github"
+  color: "0052CC"
+- name: "github_actions"
+  color: "000000"
+  description: "Pull requests that update GitHub Actions code"
+- name: "needs-changes"
+  color: "A65A86"
+- name: "on-hold"
+  color: "2526F9"
+- name: "python"
+  color: "2b67c6"
+  description: "Pull requests that update Python code"
+- name: "size:L"
+  color: "eb9500"
+  description: "This PR changes 100-499 lines ignoring generated files."
+- name: "size:M"
+  color: "ebb800"
+  description: "This PR changes 30-99 lines ignoring generated files."
+- name: "size:S"
+  color: "77b800"
+  description: "This PR changes 10-29 lines ignoring generated files."
+- name: "size:XL"
+  color: "ff823f"
+  description: "This PR changes 500-999 lines ignoring generated files."
+- name: "size:XS"
+  color: "00ff00"
+  description: "This PR changes 0-9 lines ignoring generated files."
+- name: "size:XXL"
+  color: "ffb8b8"
+  description: "This PR changes 1000+ lines ignoring generated files."
+- name: "to research"
+  color: "FBCA04"