[0.74][iOS] trigger RCTContentDidAppearNotification when content appears on bridgeless

[Kudo]

Target Branch(es)

0.74

Link to commit or PR to be picked

react/react-native#43823

Description

need this to unblock expo-splash-screen support on bridgeless. my previous fix was reverted because the RCTContentDidAppearNotification send earlier before native modules initialized.
the expo-splash-screen on bridgeless mode now is not fully working. the splash screen is still there but behinds the content view.

[cipolleschi]

picked ✅