Update Ai::ServiceAccessToken to CloudConnector::ServiceAccessToken

What does this MR do and why?

The Ai::ServiceAccessToken was recently renamed to CloudConnector::ServiceAccessToken in gitlab!142191 (merged)

This MR updates the name in the code_suggestions_setup script and will help resolve the current script failures in master https://gitlab.com/gitlab-org/gitlab/-/pipelines/1148569714, as well as help unblock gitlab!141519 (merged) once this change is made available in a new gitlab-qa release

Screenshots or screen recordings

These are strongly recommended to assist reviewers and reduce the time to merge your change.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.