Remove project violations feature flag
What does this MR do and why?
The enable_project_compliance_violations feature flag has been enabled by default since 18.3.
This MR removes the feature flag entirely.
References
Related to #551110 (closed)
MR acceptance checklist
Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.