fix: trigger CLA on bot PR review and auto-merge events

[k-alphonse]

Purpose

Closes #335.

This PR updates the CLA workflow triggers so the CLA check can run during the review and auto-merge flow for bot-created pull requests.

To-do

• None.

Content

• Updated .github/workflows/cla.yml to include review_requested and auto_merge_enabled in the pull_request_target event types.
• Preserved the existing CLA triggers for opened, reopened, synchronize, and merge_group.
• Expanded the workflow trigger coverage without changing the CLA validation logic itself.

---

• I have read and checked the items on the review checklist.

[cmbengue]

Good work on this.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.64%. Comparing base (939e2c3) to head (4ab6060).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #336   +/-   ##
=======================================
  Coverage   60.64%   60.64%           
=======================================
  Files          18       18           
  Lines        1466     1466           
=======================================
  Hits          889      889           
  Misses        577      577           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.