improvement(workspace-invites): remove confusing copy on external invites #4380

Bugbot Review

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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_94c546f8-dc55-4c1c-bf30-1a8d9e271577

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit a6067b1. Configure here.}