Fabric: Stopping messing with `clipToBounds` in RCTViewComponentView

Summary:
There was a reason why it exists: on iOS if you want to implement a view with rounded corners with a non-transparent background you need to set `clipToBounds = YES` to enabling clipping because besides drawing borders we need to clip the background otherwise it will "stick out".
There were a bunch of problems with this implementation and approach:
* It's overshooting. It applies `clipToBounds` no matter which border-radius is and no matter is there a background or not. So, it's kinda heuristic implementation and it's totally unexpected behavior sometimes.
* The previous problems can lead to performance problems as well (clipping requires additional work to do for CoreGraphics/GPU).
* The border-radius that we assigned to contentView is incorrect because it does not take border-width into account.
* This functionality only applies to non-null `contentView` which is a rear and custom case in which that can always be done manually for components that require that for some reason.

Reviewed By: mdvacca

Differential Revision: D15397282

fbshipit-source-id: 1599882ca8e591a9c4edb4d2b845bbf3d147bfce

React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.mm

@@ -412,8 +412,6 @@ static RCTBorderStyle RCTBorderStyleFromBorderStyle(BorderStyle borderStyle)
     CGColorRelease(borderColor);
     layer.cornerRadius = (CGFloat)borderMetrics.borderRadii.topLeft;
     layer.backgroundColor = _backgroundColor.CGColor;
-    _contentView.layer.cornerRadius = (CGFloat)borderMetrics.borderRadii.topLeft;
-    _contentView.layer.masksToBounds = YES;
   } else {
     if (!_borderLayer) {
       _borderLayer = [[CALayer alloc] init];
@@ -427,8 +425,6 @@ static RCTBorderStyle RCTBorderStyleFromBorderStyle(BorderStyle borderStyle)
     layer.borderWidth = 0;
     layer.borderColor = nil;
     layer.cornerRadius = 0;
-    _contentView.layer.cornerRadius = 0;
-    _contentView.layer.masksToBounds = NO;
 
     UIImage *image = RCTGetBorderImage(
         RCTBorderStyleFromBorderStyle(borderMetrics.borderStyles.left),