Alert users on GitLab.com to rotate old Oauth secrets

Release notes

Problem to solve

Proposal

One idea to consider (or update/ignore after more validation) - add a column to show created at for the Applications:

Project access tokens	Application screen	suggested change

That would show users how old the app is. Also consider adding a help bubble or a warning sign to provide guidance for very old apps & that they should be rotated.

Implementation

1. Add a Created column to ../profile/applications
2. Create a page level information banner:
   • At least one of your personal access tokens is more than 000 days old. You should revoke and create new personal access tokens regularly for better security.
3. The alert should appear when atleast one of the OAuth tokens are over 365 days old.

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Availability & Testing

Add feature level test to validate the banner is shown when old PATs exist.