Merge branch '418283-clean-up-code-suggestions-alert-feature-flag' into 'master'

Cleaned up code_suggestions_alert and feature flag

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/127241



Merged-by: Roy Zwambag <rzwambag@gitlab.com>
Approved-by: Aman Luthra <aluthra@gitlab.com>
Approved-by: Roy Zwambag <rzwambag@gitlab.com>
Co-authored-by: Ross Byrne <robyrne@gitlab.com>