Add GraphQL mutation for personal access token rotation

What does this MR do and why?

Similar to the REST API endpoint to rotate a personal access token, this MR adds personalAccessTokenRotate mutation to enable rotating personal access tokens through the GraphQL API.

References

[BE] Graphql mutation to rotate fine-grained PAT (#583545).

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Enable granular_personal_access_tokens feature flag
2. Login with any user
3. Create a personal access token
4. Get the global ID of the created personal access token

   $ rails c
   > PersonalAccessToken.last.to_global_id.to_s
   => "gid://gitlab/PersonalAccessToken/<id>"

5. Go to http://localhost:3000/-/graphql-explorer and run the following mutation

   mutation {
     personalAccessTokenRotate(input: { id: "gid://gitlab/PersonalAccessToken/<id>" }) {
       token {
         name
       }
       errors
     }
   }

6. Verify that errors is empty
7. Verify that token contains data of the newly created token

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