Make rate limits on project/:id/jobs endpoints configurable in the UI

Release notes

Rate limits on the project/:id/jobs API were added recently, and as a follow up we want to enable the limit to be configurable so that instance administrators can change the limit using the GitLab UI.

Now, if you are an instance admin, you can easily configure the project/:id/jobs API rate limit.

Proposal

We added rate limits to the project/:id/jobs api endpointin !104912 (merged)

As a next iteration, we'll want to allow this limit to be configurable just like the pipeline creation rate limits so that SRE's or instance admins can change the limit using GitLab's UI

See discussion under original issue for more details #382985 (comment 1183513487) (internal)