PUT /api/:version/projects/:id/hooks/:hook_id can be slow

Summary

The PUT /api/:version/projects/:id/hooks/:hook_id endpoint can be slow, which has a negative impact on error-budgets.

See: https://log.gprd.gitlab.net/goto/20e88380-ecfe-11ec-b86b-d963a1a6788e

Possible fixes

TBD