Remove feature flag for combined policy list backend part
What does this MR do and why?
This code change removes a feature flag called security_policies_combined_list that was previously controlling access to security policy functionality. The feature flag was acting as a gate - when disabled, users couldn't access the combined security policies list and would get errors or empty results.
By removing this feature flag and its associated checks, the security policies functionality is now permanently enabled for all users. The code also removes all the test cases that were specifically testing the behavior when this feature flag was turned off, since that scenario no longer exists.
This is essentially promoting a feature from "experimental" or "beta" status to being fully available to everyone, simplifying the codebase by removing the conditional logic that was no longer needed.
References
Screenshots or screen recordings
***NO VISUAL CHANGES***
How to set up and validate locally
- Go to Secure policies
- Check taht everything is loading correctly with and without FF
security_policies_combined_list
MR acceptance checklist
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Related to #573323