Remove /workflow command as not existing anymore (#24095)

Based on
https://github.com/zed-industries/zed/issues/16913#issuecomment-2629424808
Follow-up of https://github.com/zed-industries/zed/pull/19900

Release Notes:

- N/A
f7d2b5300cKirill Bulatov committed on 2/2/2025, 3:05:57 PM· committed by GitHubparent2f82374
1 file changedLine totals unavailable