[ReactNative] Remove unused touch arrays

Summary:
These two arrays aren't used. The code is easier to read without them

@public

Test Plan: Tap around UIExplorer and verify multi-touch and responder system behavior works the same

React/Base/RCTTouchHandler.m

@@ -36,8 +36,6 @@
 
   BOOL _recordingInteractionTiming;
   CFTimeInterval _mostRecentEnqueueJS;
-  NSMutableArray *_pendingTouches;
-  NSMutableArray *_bridgeInteractionTiming;
 }
 
 - (instancetype)initWithBridge:(RCTBridge *)bridge
@@ -52,9 +50,6 @@
     _reactTouches = [[NSMutableArray alloc] init];
     _touchViews = [[NSMutableArray alloc] init];
 
-    _pendingTouches = [[NSMutableArray alloc] init];
-    _bridgeInteractionTiming = [[NSMutableArray alloc] init];
-
     // `cancelsTouchesInView` is needed in order to be used as a top level
     // event delegated recognizer. Otherwise, lower-level components not built
     // using RCT, will fail to recognize gestures.