Remove Beta Label from Personal Preferences Code Suggestions Toggle

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/140094



Merged-by: Smriti Garg <sgarg@gitlab.com>
Approved-by: Deepika Guliani <dguliani@gitlab.com>
Approved-by: Smriti Garg <sgarg@gitlab.com>
Co-authored-by: Kevin Chu <kchu@gitlab.com>