fix: add null checks for getViewState in SurfaceMountingManager

[ManasGuptaSprinklr]

Summary:

Fix SurfaceMountingManager null handling for methods that can be invoked after a view has been deleted or is otherwise missing. sendAccessibilityEvent and setJSResponder now use getNullableViewState(...) and guard against missing ViewState before accessing .view, logging a soft exception and returning instead of crashing. Also removed the now-unused getViewState helper.

Changelog:

[ANDROID][FIXED] Avoid crash in SurfaceMountingManager when sendAccessibilityEvent or setJSResponder is called for a missing or deleted view state.

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