Restrict PAT informaton endpoint to PAT authentication

Aboobacker MKrequested to merge
tachyons_fix_pat_oauth_auth into master

What does this MR do and why?

Currently sending request to a PAT information endpoint with Oauth access token authentication returns 500 error. We are changing it to 400 with proper error message

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Before After

How to set up and validate locally

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  1. Create an oauth access token
  2. Send a request to `/api/v4/personal_access_tokens/self" with that OAuth access token
  3. Ensure that endpoint returns 400 instead of 500
Edited by Aboobacker MK

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