Enforce offset pagination limit on Projects API

What does this MR do and why?

Enforces the offset pagination limits to unauthenticated Projects API requests (defaults to 50,000 offset)

https://docs.gitlab.com/administration/instance_limits/#max-offset-allowed-by-the-rest-api-for-offset-based-pagination

References

• Breaking Change Exception: https://gitlab.com/gitlab-com/Product/-/issues/14429
• Related to #581517

Screenshots or screen recordings

N/A

How to set up and validate locally

1. Make an unauthenticated requests to http://localhost:3000/api/v4/projects?page=2501
   • Based on 2501 (page) * 20 (default page size) = 50,020.
2. You should get the following result {"error":"Offset pagination has a maximum allowed offset of 50000 for requests that return objects of type Project. Remaining records can be retrieved using keyset pagination."}

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.