SAST VR - Backend - Rename custom ability to give it a more generic name
## TL;DR
We created a custom ability in https://gitlab.com/gitlab-org/gitlab/-/work_items/599602 (see: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/235831). We called it `update_sast_vr_setting`. We eventually want to have the same ability for all AI workflows (from sec), and making the name more generic now to be re-used in the future will safe us work eventually.
## Acceptance Criteria
- [ ] Specific, testable criterion 1
- [ ] Specific, testable criterion 2
## Implementation Details
Technical specifics e.g. files to change, functions, API endpoints, or data model updates.
## Testing Approach
- [ ] Unit tests
- [ ] Integration tests
- [ ] Manual validation steps
## Estimate
issue