Add information about License Approval Policies feature flag
What does this MR do and why?
This MR adds note about License Approval Policies feature flag disabled by default.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #382750 (closed)