Cleanup security_policies_optional_variables_control and fix schedules

Martin Cavojrequested to merge
525129-fe-feature-flag-clean-up-feature-flag-security_policies_optional_variables_control into master

What does this MR do and why?

Cleanup security_policies_optional_variables_control and fix scheduled PEPs that automatically add variables_override option into the YAML, although it's not supported and not in the schema. The support should be added in #543105.

Depends on BE cleanup: !196822 (merged).

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Related to #525129 (closed)

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