Frontend: Use the new uncached endpoint for MR security findings per scanner

Summary

#390281 (closed) provides a new endpoing so that the state is not cached.

New endpoints are in the following format:

/-/merge_requests/1/sast_reports => /-/merge_requests/1/security_reports?type=dast

Verification steps

• Go to svedova/security-reports-v2!1 (closed)
• Verify that findings are loading
• Verify that clicking on a finding opens the Modal with most of the information being displayed (MR Feedback, Issue Feedback and Dismissal notes are missing - that's going to be implemented in a separate MR)