Clean up split_operations_visibility_permissions feature flag

What does this MR do and why?

Clean up the split_operations_visibility_permissions flag which was default enabled in %15.6.

Implementation MRs:

• Add Infrastructure Visibility Toggle (frontend) (!101976 - merged)
• Split 'infrastructure' access_level from 'opera... (!101610 - merged)
• Split environments visibility setting from oper... (!93118 - merged)
• Split Feature Flags visibility setting from Ope... (!94102 - merged)
• Split monitor visiblity setting from operations (!91337 - merged)
• Test Deployments menu behaviour with new featur... (!95414 - merged)
• Add columns for operations toggle split (!89089 - merged)
• Add a toggle to enable or disable environments (!94254 - merged)
• Add a toggle to enable or disable feature flags (!95411 - merged)

The Releases toggle was enabled on its own in Enable Releases feature toggle (!99045 - merged).

Related to #364240 (closed)

Screenshots or screen recordings

Screen_Recording_2022-12-14_at_5.13.38_PM

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