chore: add advanced PR auto-labeling configuration and workflow

[Ludy87]

Description of Changes

Please provide a summary of the changes, including:

• Added .github/labeler-config-srvaroa.yml to define a comprehensive auto-labeling configuration for PRs based on title patterns and file paths.
• Introduced a new GitHub Actions workflow .github/workflows/auto-labelerV2.yml that uses the srvaroa/labeler action to automatically label pull requests.
• Extended .github/labels.yml to include missing label definitions required for the auto-labeling setup (e.g., Bugfix, build, ci, perf, etc.).

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Checklist

General

• I have read the Contribution Guidelines
• I have read the Stirling-PDF Developer Guide (if applicable)
• I have read the How to add new languages to Stirling-PDF (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 (if functionality has heavily changed)
• I have read the section 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 for more details.

[Copilot]

Pull Request Overview

This PR adds an advanced auto-labeling configuration for pull requests by introducing a dedicated GitHub Actions workflow and updating label definitions.

• Added a GitHub Actions workflow (.github/workflows/auto-labelerV2.yml) to automatically label PRs.
• Extended the labels configuration in (.github/labels.yml) with additional definitions.
• Created a new auto-labeler configuration file (.github/labeler-config-srvaroa.yml) specifying rules based on PR titles and file paths.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.github/workflows/auto-labelerV2.yml	Configures the auto-labeling workflow using the srvaroa action.
.github/labels.yml	Adds new label definitions to support the auto-labeler.
.github/labeler-config-srvaroa.yml	Establishes auto-labeling rules based on title patterns and file paths.

Comments suppressed due to low confidence (1)

.github/labeler-config-srvaroa.yml:31

• Duplicate configuration for the 'API' label is present (also defined later at line 73). Consider merging these configurations into a single rule or clearly distinguishing their intended scopes to avoid potential conflicts.

  - label: 'API'