Remove Feature Flag isolation_status_check

Rutger Wesselsrequested to merge
578976-remove-feature-flag into master

What does this MR do and why?

Remove Feature Flag isolation_status_check. It was a derisk feature flag, no UX involved

It is 100% enabled (since 2026-08-17 12:36 UTC) and stable so we can remove this FF

References

Related to #578976 (closed)

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Edited by Rutger Wessels

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