fix(android): Add multi-activity awareness to ReactHostImpl.onHostDestroy

[joemun]

Based on this previous fix: e09d4e8

onHostPause checks activeActivities and skips pausing when other activities are still active. onHostDestroy lacked this check, so destroying a secondary activity while the primary was still alive would move the shared ReactContext to BEFORE_CREATE:

react-native/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/runtime/ReactHostImpl.kt

Lines 794 to 797 in e291c1e

	private fun moveToHostDestroy(currentContext: ReactContext?) {
	reactLifecycleStateManager.moveToOnHostDestroy(currentContext)
	currentActivity = null
	}

react-native/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/runtime/ReactLifecycleStateManager.kt

Lines 70 to 90 in e291c1e

	fun moveToOnHostDestroy(currentContext: ReactContext?) {
	currentContext?.let {
	when (state) {
	LifecycleState.BEFORE_RESUME -> {
	bridgelessReactStateTracker.enterState("ReactContext.onHostDestroy()")
	it.onHostDestroy()
	}
	LifecycleState.RESUMED -> {
	bridgelessReactStateTracker.enterState("ReactContext.onHostPause()")
	it.onHostPause()
	bridgelessReactStateTracker.enterState("ReactContext.onHostDestroy()")
	it.onHostDestroy()
	}
	else -> {
	/* Do nothing */
	}
	}
	}
	state = LifecycleState.BEFORE_CREATE
	}

If the primary activity was never paused, no subsequent onHostResume would fire, leaving the context permanently destroyed and unresponsive to input.