Move sast_reports and secret_detection_reports to CE [RUN AS-IF-FOSS]

What does this MR do?

These changes are related to Make sast and secret_detection methods available to CE. SAST and Secret Detection are now available in CE. We need to move all the functionalities required to generate security reports for SAST and Secret Detection. In this MR, we are focusing on moving https://gitlab.com/gitlab-org/gitlab/-/blob/841ee3eb43b7f3d8425380868ba7c2f126771092/ee/app/controllers/ee/projects/merge_requests_controller.rb#L47-53 and corresponding specs.

This MR is not intended to include all the necessary backend changes for Make sast and secret_detection methods available to CE. The goal here is to break the changes up a bit to make them more manageable.

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content