redirect to keys index instead of user index after a key is deleted

Originally opened at !10227 (closed) by @jouve.

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What does this MR do?

in the admin view, go to user, then go to keys (list of keys), then delete a key. After the key is deleted, I expect to be redirected to the list of keys instead of the user page.

This PR changes the redirect from user page to keys page.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together