Allow deletion of api keys with media

[jayjay-w]

Description

Allow deletion of API keys even if the key's user has been used to create media.

References: CV2-5096

How has this been tested?

Tested in the UI using these steps:

1. Create an Api Key
2. Use the token to create project media
3. Confirm that the Api Key can be deleted

Checklist

• I have performed a self-review of my own code
• I have added unit and feature tests, if the PR implements a new feature or otherwise would benefit from additional testing
• I have added regression tests, if the PR fixes a bug
• I have added logging, exception reporting, and custom tracing with any additional information required for debugging
• I considered secure coding practices when writing this code. Any security concerns are noted above.
• I have commented my code in hard-to-understand areas, if any
• I have made needed changes to the README
• My changes generate no new warnings
• If I added a third party module, I included a rationale for doing so and followed our current guidelines

[caiosba]

Just a note that I would suggest a test for this case but I see that the coverage is still 100% so it's already covered by some other test.