Compliance Adherence Report (Backend)
### Problem to solve
See parent epic for more background https://gitlab.com/groups/gitlab-org/-/epics/7854+
Designs from here https://gitlab.com/gitlab-org/gitlab/-/issues/398212+
### Intended users
* [Cameron (Compliance Manager)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#cameron-compliance-manager)
### Proposal
Build out adherence report backend. See here for implementation details https://gitlab.com/gitlab-org/gitlab/-/issues/404937+s
epic