Resolve "Datepicker for Access Tokens let you chose current day"

What does this MR do?

Currently, it's possible to create a personal access token with an expiry date of today or in the past. These PATs are immediately invalid and we should prevent them from being created.

This should be carried out in a validation and not on the frontend, because a Personal Access Tokens API is anticipated and the validation will handle creation of these tokens in the past too.

• https://gitlab.com/gitlab-org/gitlab-ce/issues/27954

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered

What are the relevant issue numbers?

Closes #32680 (moved)