fix(podspec): comment out duplicate scrollview subspec in React-FabricComponents

# [macOS

The `scrollview` subspec is declared in BOTH `React-Fabric.podspec` and
`React-FabricComponents.podspec`, with overlapping `source_files`:

  React-Fabric.podspec:
    react/renderer/components/scrollview/**/*.{m,mm,cpp,h}   (recursive)

  React-FabricComponents.podspec:
    react/renderer/components/scrollview/*.{m,mm,cpp,h}
    react/renderer/components/scrollview/platform/cxx/**/*

Both globs include the same top-level files (ScrollViewShadowNode.cpp,
BaseScrollViewProps.cpp, ScrollEvent.cpp, etc.). After `pod install`,
those source files end up in both the React-Fabric and React-FabricComponents
Pods targets.

What breaks:
- Consumers that link both libraries (e.g. via `-all_load`) hit
  duplicate symbol errors at link time.
- Consumers that deduplicate by hand by dropping scrollview from one
  target break differently: React-Fabric's
  mounting/internal/CullingContext.cpp references ScrollViewShadowNode,
  so if the dedup drops it from React-Fabric, link fails with
  `Undefined symbols: ScrollViewShadowNode`.

Comment out (rather than delete) the duplicate scrollview subspec in
React-FabricComponents, using the macOS diff-tag convention. The
recursive glob in React-Fabric.podspec's scrollview subspec already
covers everything FabricComponents was listing
(top-level files + scrollview/platform/cxx/**/*).

# macOS]

Author: Saadnajmi

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

@@ -101,14 +101,25 @@ 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
+    # [macOS The "scrollview" subspec below duplicates source_files already declared in
+    # React-Fabric.podspec's "scrollview" subspec (which uses a recursive
+    # `react/renderer/components/scrollview/**/*` glob). The overlap causes
+    # ScrollViewShadowNode.cpp and friends to be compiled into both the
+    # React-Fabric and React-FabricComponents Pods targets, breaking consumers
+    # that link both libraries via `-all_load` (duplicate symbols). Comment it
+    # out here so scrollview is only built into React-Fabric -- where
+    # React-Fabric's mounting/internal/CullingContext.cpp already needs
+    # ScrollViewShadowNode anyway.
+    #
+    # 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
+    # macOS]
 
     ss.subspec "text" do |sss|
       sss.source_files         = podspec_sources(["react/renderer/components/text/*.{m,mm,cpp,h}",