[REF-2172] Add DECORATED_PAGES before compiling in thread #2841
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py38 and py39 cannot get asyncio.Lock() instances in a thread that has no event loop running, so if a decorated page (@rx.page) depends on state, it needs to be added to the app in the MainThread and trigger the redis connection in the that thread.
Since compile_ now happens in a separate thread, reflex cannot safely add decorated pages during compile_.
This PR is based on #2839 to get CI coverage for py3.8 in the integration tests. That PR will fail... and this PR will fix it!