Add auto label action

[mawad-amd]

Motivation

Add auto label action:

1. Labels anything with iris so it gets auto added to the GH project
2. label issues with appropriate labels

Technical Details

Test Plan

Test Result

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[Copilot]

Pull Request Overview

This PR adds an automated labeling system for GitHub issues and pull requests. The system automatically applies the "iris" label to all new issues and PRs for project management purposes, and also applies contextual labels based on content patterns.

• Implements GitHub Actions workflow for automatic labeling on issue/PR creation
• Configures label mapping for feature requests, bugs, and documentation using title patterns
• Sets up sparse checkout to optimize the workflow by only retrieving necessary configuration files

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/auto-label.yml	Defines the GitHub Actions workflow that triggers on new issues/PRs and uses the auto-label action
.github/workflows/auto-label.json5	Configuration file specifying label mappings and default "iris" label application

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