Enable `webui_members_inherited_users` feature flag by default

Abdul Wadoodrequested to merge
364078-enable-by-default-webui_members_inherited_users into master

What does this MR do and why?

Merged only after the feature flag has been enabled on production #364078 (closed).

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

How to set up and validate locally

See !144638 (merged).

Related to #364078 (closed)

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