[ios] Force going through begin in state manager (#3979)

## Description

The state manager was not functioning correctly on iOS because the state
change from begin to activate did not go through begin.
`handleStateChange` doesn't call `handleGesture` for activate directly
as it bypasses gesture interaction system. Instead it relies on the
activate gesture being called from reset.

It worked previously, but after commit
c6051ca introduced a direct check in
`handleGesture` to determine whether it was invoked from reset. As a
result, manually handled gestures were never activated.


## Test plan

Tested on the StateManager example.

Author: akwasniewski

packages/react-native-gesture-handler/apple/RNGestureHandlerModule.mm

@@ -225,6 +225,10 @@ - (void)setGestureStateSync:(int)state forHandler:(int)handlerTag
     } else if (state == 3) { // CANCELLED
       handler.recognizer.state = RNGHGestureRecognizerStateCancelled;
     } else if (state == 4) { // ACTIVE
+      if (handler.recognizer.state == UIGestureRecognizerStatePossible) {
+        // Force going from UNDETERMINED to ACTIVE through BEGAN to preserve the correct state transition flow.
+        [handler handleGesture:handler.recognizer fromReset:NO];
+      }
       [handler stopActivationBlocker];
       handler.recognizer.state = RNGHGestureRecognizerStateBegan;
     } else if (state == 5) { // ENDED