GUARD-2071: Remove Advanced CodeQL setup in favor of Default Setup

The Advanced CodeQL workflow was originally added to work around IP
allowlist restrictions that prevented standard GitHub runners from
uploading SARIF results to GHAS.

Now that the org-level GHAS configuration uses the labeled runner
`ubuntu-24.04-2cores-tools-public` which has allowlisted IPs, this
repo can use the Default Setup managed at the org level.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: UjjwalSaini19