fix(CO-4739): replace GH_TOKEN with GH_TOKEN_READ_PACKAGE in publish_agent workflow

[sandeepkatalon]

What

Replace GH_TOKEN with org-level secret GH_TOKEN_READ_PACKAGE in the checkout step of the commit job.

Why

Migrating from PATs to more secure token usage as part of the org-wide CI/CD authentication improvement.

Changes

• .github/workflows/publish_agent.yml

Jira

CO-4739

Summary by Aikido

Security Issues: 0	Quality Issues: 0	Resolved Issues: 0

⚡ Enhancements

• Replaced GH_TOKEN with GH_TOKEN_READ_PACKAGE in publish_agent workflow checkout step

^{More info}