Refactor code suggestions provision service to generalized service

- Renamed `ProvisionCodeSuggestionsService` to `ProvisionAddOnService`
and generalized it to handle any add-on provisioning.
- Updated references and tests across relevant files
(`activate_service.rb`, `destroy_service.rb`,
`sync_seat_link_request_worker.rb`, and their respective specs)
to reflect this change.
- Introduced dynamic naming and querying for add-ons based on
parameters to enhance flexibility and maintainability.

EE: true