Display Usage type field for SSH keys
What does this MR do and why?
The feature flag has been introduced in !104283 (merged) in order to coordinate the feature release with Sign commits with your SSH key (#343879 - closed)
Now when it's enabled and verified on staging and production: #383046 (comment 1191515947), there's no need in keeping this feature flag, since it's just hides/shows a select field on UI