Make project_repositories_changelog Rate Limit Configurable Via Application Setting
In this MR: https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/4608 we added a rate limit to the projects `:id/repository/changelog` POST and GET endpoints.
The [Gitlab Performance Tool](https://handbook.gitlab.com/handbook/engineering/infrastructure/test-platform/performance-and-scalability/#performance-tool) is used to test endpoint performance under load, and disables application rate limits to do so. If a rate limit is not configurable, it can cause issues testing. Some additional context where a similar rate limit ran into some issues is here: https://gitlab.com/gitlab-org/quality/quality-engineering/team-tasks/-/issues/3253#note_2256131160
We should make the `:id/repository/changelog` rate limits configurable via an application setting.
issue