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

[k-alphonse]

Purpose

Closes #441

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 95.14%. Comparing base (20195a5) to head (e346c2c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #442      +/-   ##
==========================================
+ Coverage   95.09%   95.14%   +0.04%     
==========================================
  Files          12       12              
  Lines        2408     2408              
==========================================
+ Hits         2290     2291       +1     
+ Misses        118      117       -1     

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