Fix `license_compliance_denies_mr` feature flag

What does this MR do?

Related to #241771 (closed) and !42268 (merged)

Ensures that license_compliance_denies_mr is used consistently in a codebase.

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