[0.85] Fix stuck loading banner after a reload

[cipolleschi]

Target Branch

0.85

Link to commit or PR to be picked

facebook/react-native@bec2933

Description

Fixes an issue on iOS where the "Loading from Metro..." banner can remain stuck on screen after a reload.

RCTInstance._loadScriptFromSource posts RCTInstanceDidLoadBundle, not RCTJavaScriptDidLoadNotification. The legacy notification is never posted, so the existing native hide path is dead.

Also, RCTDevLoadingView has no cleanup. Without hiding the window and clearing its reference, it remains alive and stuck on screen.

[github-actions]

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