fix(workflows): disallow duplicate workflow names at the same folder level #3260

Bugbot Review

Bugbot Analysis Progress (12m 7s elapsed)

✅ Gathered PR context (2s)
✅ Completed bug detection (12m 2s)
✅ Posted analysis results (3s)

Final Result: Bugbot completed review and found 1 potential issue.

Request ID: serverGenReqId_cfa08440-048b-44bb-857b-f16dfa11e3a8

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.}