Improve security policy comparison before persisting

What does this MR do and why?

This MR updates the comparison logic of security policy persistence to fix policy_scope field when it is only updated. Since we are comparing the stringified keys with symbol keys, policy_scope is considered to be updated even if it is not updated.

This MR also adds an additional improvement to return early when the a disabled policy is created to avoid additional queries.

MR acceptance checklist

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