Restore render blocker around client apps until data is ready #13513
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Description
This PR adds back in the render blocker around client apps until data is ready. We always used to have this, but it was removed recently as part of the new app skeleton work to smooth out a few frames of jank from the initial load.
Unfortunately this has caused a few issues so needs to be reverted. This also has the bonus of reducing multiple wasted API calls.
Addresses