Ted Johansson 907db4d5fd
DEV: Remove plugin sidebar rendering fallback (#31012)
We used this flag for experimenting with admin plugin sidebars. We have now settled on a tabbed layout, and this is no longer needed.

This PR simply ignores the flag in a backwards-compatible way, so we can discontinue usage in plugins and then remove the backwards-compatibility in core.
2025-01-28 09:42:24 +08:00
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