fix(pipeline): correct paths for pipeline & support default WebUI pipeline config extraction (#4051)

# Description of Changes

- **What was changed:**  
- Updated `.github/labeler-config-srvaroa.yml` to include
`app/core/src/main/resources/static/pipeline/defaultWebUIConfigs/**`
under the labeler paths.
- Removed `COPY pipeline /pipeline` from all three Dockerfiles to slim
down images.
- Added a new `PIPELINE_PATH` constant and `getPipelinePath()` method in
`InstallationPathConfig.java`.
- Implemented `GeneralUtils.extractPipeline()` to copy default pipeline
JSON configs (`OCR images.json`, `Prepare-pdfs-for-email.json`,
`split-rotate-auto-rename.json`) from classpath into the installation
directory.
- Invoked `GeneralUtils.extractPipeline()` during initial setup in
`InitialSetup.java`.
  - Updated `.gitignore` to treat `./pipeline/` as ignored.  

- **Why the change was made:**  
Ensures that default WebUI pipeline configurations are automatically
extracted at runtime rather than baked into the image, improving
flexibility and reducing image size.

---

## 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/devGuide/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/devGuide/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/devGuide/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/devGuide/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: Anthony Stirling <[email protected]>
Co-authored-by: Copilot <[email protected]>

Dockerfile.fat

@@ -26,7 +26,6 @@ FROM alpine:3.22.1@sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8
 
 # Copy necessary files
 COPY scripts /scripts
-COPY pipeline /pipeline
 COPY app/core/src/main/resources/static/fonts/*.ttf /usr/share/fonts/opentype/noto/
 # first /app directory is for the build stage, second is for the final image
 COPY --from=build /app/app/core/build/libs/*.jar app.jar