Code changes to rename prsd to spp

What does this MR do and why?

Issue: #462504 (closed)

Branched off: !177824 (merged)

Since we have renamed application_settings.pre_receive_secret_detection_enabled -> application_settings.secret_push_protection_available and project_security_settings.pre_receive_secret_detection_enabled -> project_security_settings.secret_push_protection_enabled, we need to update all references in the code from the old column name to the new column name. This MR looks like it has many changes, but there are no change to the logic, it's only a rename.

References

Please include cross links to any resources that are relevant to this MR. This will give reviewers and future readers helpful context to give an efficient review of the changes introduced.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Before	After

How to set up and validate locally

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