fix(rn-tester): use framework-style import for RCTFabricComponentsPlugins.h

The quoted form resolves only under CocoaPods (header maps re-vend the
bare filename via FACADE_REEXPOSED_HEADERS in rncore_facades.rb).
SwiftPM exposes React headers as an include directory, so the header is
only reachable as <React/RCTFabricComponentsPlugins.h> — the quoted
import makes MyNativeView fail to compile when rn-tester is converted
to SwiftPM. The angle form resolves under both distributions.

Cherry-picked from the SPM stack (ecdd1771019).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: chrfalch

packages/rn-tester/NativeComponentExample/ios/RNTMyNativeViewComponentView.mm

@@ -13,7 +13,7 @@
 #import <react/renderer/components/AppSpecs/Props.h>
 #import <react/renderer/components/AppSpecs/RCTComponentViewHelpers.h>
 
-#import "RCTFabricComponentsPlugins.h"
+#import <React/RCTFabricComponentsPlugins.h>
 
 using namespace facebook::react;