chore: remove main branch push from staging step 3 workflow

[nickolas-dimitrakas]

Background

• The staging step 3 workflow currently pushes release commits to both master and main, but main has diverged from main as we transition to using the main branch as the production branch.

What Has Changed

• Removed git push origin HEAD:main from the staging step 3 synchronization workflow
• Updated the comment to note that we will eventually migrate from master to main

Checklist

• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• I have added tests that prove my fix is effective or that my feature works.
• I have tested this locally.

Reference Issue (For employees only. Ignore if you are an outside contributor)

• NO JIRA

[cursor]

PR Summary

Low Risk
Low risk: CI-only change that removes a redundant git push target; impact is limited to branch synchronization behavior in the release workflow.

Overview
Workflow behavior change: staging-step-3.yml no longer pushes release commits from staging to the main branch; it now only syncs to development, master, and the release-order branches.

Also updates the inline comment to reflect the planned migration from master to main.

^{Written by Cursor Bugbot for commit 645c54a. This will update automatically on new commits. Configure here.}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[rmi22186]

Let's hold off on this once we merge v3 in to main.