Application Passwords: Add end-to-end (e2e) tests.
Adds end-to-end (e2e) tests for the following test scenarios:
- Create a new application password.
- Create an application password with an existing name.
- Revoke a single application password.
- Bulk revoke applications passwords.
Follow-up to [49109], [49276], [49562], [50001], [50367], [51463].
Props justinahinon, swissspidy, juhise, kevin940726, isabel_brison.
Fixes #54241.