Remove offset pagination from `GET /api/:version/projects/:id/jobs` API endpoint

Problem

Usage of offset to paginate through results of this API is slow. in #362172 (closed) keyset pagination was introduced to address this but the offset method needs to be left until a major API version.

Proposal

1. Remove the ability to paginate with offsets on the API endpoint
2. Update documentation

Deprecation Table

Group	Issue Link
backend	Introduce Keyset pagination for `GET /api/:ver... (#362172 - closed)
backend	👈 You are here