ci: Added workflow for checking broken links in Markdown files

[Rohini-Microsoft]

Purpose

This pull request adds a new GitHub Actions workflow to check for broken links in markdown files. The workflow is designed to run on pull requests and manual triggers, ensuring that markdown files are free of broken links.

Workflow addition:

.github/workflows/broken-links-checker.yml: Introduced a new workflow named "Broken Link Checker" that uses the lychee-action to validate links in markdown files. It checks only changed markdown files for pull requests and all markdown files for manual triggers.

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• I have built and tested the code locally and in a deployed app
• For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• This is a change for all users of this app. No code or asset is specific to my use case or my organization.

Other Information

[github-actions]

🎉 This PR is included in version 1.5.0 🎉

The release is available on GitHub release

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