Update qa selectors to testid related to 'file' directory in pages

What does this MR do and why?

Update data-qa-selectors to data-testid in qa/qa/page/file and related files.

It is a wide effort based on gitlab-org/quality/quality-engineering/team-tasks#1735

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.