Implement fake pagination for files list in repo overview

[RulaKhaled]

Since we cannot paginate the data at the database level, we’ll implement fake pagination. This approach will simulate pagination by chunking the data on the backend and rendering it incrementally on the frontend.

More context can be found here https://github.com/codecov/internal-issues/issues/656#issuecomment-2358606170

follow up to https://github.com/codecov/internal-issues/issues/656 investigation