fix: remove duplicate scrollview subspec from React-FabricComponents

The `scrollview` subspec is declared in BOTH React-Fabric.podspec
and React-FabricComponents.podspec with overlapping source_files
(both include `react/renderer/components/scrollview/*.cpp`). This
causes ScrollViewShadowNode.cpp and related sources to be compiled
into both the React-Fabric and React-FabricComponents pod targets.

Consumers that link both libraries (e.g. via `-all_load`) hit
duplicate symbol errors. Consumers that link only React-Fabric
break differently if the duplicate-removal happens to drop the
sources from React-Fabric (which it does on some downstream
generators) -- React-Fabric's `mounting/internal/CullingContext.cpp`
references `ScrollViewShadowNode`, so without those sources in the
same lib, link fails with `Undefined symbols: ScrollViewShadowNode`.

Keep the scrollview subspec only in React-Fabric (where the existing
`react/renderer/components/scrollview/**/*` glob already covers the
files React-FabricComponents was listing).

Author: Saadnajmi

packages/react-native/ReactCommon/React-FabricComponents.podspec

@@ -101,15 +101,6 @@ Pod::Spec.new do |s|
       sss.header_dir           = "react/renderer/components/safeareaview"
     end
 
-    ss.subspec "scrollview" do |sss|
-      sss.source_files         = podspec_sources(["react/renderer/components/scrollview/*.{m,mm,cpp,h}",
-                                  "react/renderer/components/scrollview/platform/cxx/**/*.{m,mm,cpp,h}"],
-                                  ["react/renderer/components/scrollview/*.h",
-                                  "react/renderer/components/scrollview/platform/cxx/**/*.h"])
-      sss.exclude_files        = "react/renderer/components/scrollview/tests"
-      sss.header_dir           = "react/renderer/components/scrollview"
-    end
-
     ss.subspec "text" do |sss|
       sss.source_files         = podspec_sources(["react/renderer/components/text/*.{m,mm,cpp,h}",
                                   "react/renderer/components/text/platform/cxx/**/*.{m,mm,cpp,h}"],