Revert "Add `SingleChildScrollView` for `NavigationRail`" (#143097)

Reverts flutter/flutter#137415

Reverting due to https://github.com/flutter/flutter/issues/143061. this is breaking some existing use cases, see also https://github.com/flutter/samples/pull/2157. If we try this again, we need to add this in less breaking way.

Fixes https://github.com/flutter/flutter/issues/143061

packages/flutter/lib/src/material/navigation_rail.dart

@@ -439,7 +439,6 @@ class _NavigationRailState extends State<NavigationRail> with TickerProviderStat
                 Expanded(
                   child: Align(
                     alignment: Alignment(0, groupAlignment),
-                    child: SingleChildScrollView(
                     child: Column(
                       mainAxisSize: MainAxisSize.min,
                       children: <Widget>[
@@ -476,7 +475,6 @@ class _NavigationRailState extends State<NavigationRail> with TickerProviderStat
                     ),
                   ),
                 ),
-                ),
               ],
             ),
           ),

packages/flutter/test/material/navigation_rail_test.dart

@@ -3605,62 +3605,6 @@ void main() {
     expect(inkFeatures, paints..circle(color: Colors.transparent));
   }, skip: kIsWeb && !isCanvasKit); // https://github.com/flutter/flutter/issues/99933
 
-  testWidgets('NavigationRail can scroll in low height', (WidgetTester tester) async {
-    // This is a regression test for https://github.com/flutter/flutter/issues/89167.
-    await tester.pumpWidget(
-      MaterialApp(
-        theme: ThemeData(
-          useMaterial3: true,
-        ),
-        home: Builder(
-          builder: (BuildContext context) {
-            return MediaQuery(
-              // Set Screen height with 300
-              data: MediaQuery.of(context).copyWith(size: const Size(800, 300)),
-              child: Scaffold(
-                body: Row(
-                  children: <Widget>[
-                    // Set NavigationRail height with 100
-                    SizedBox(
-                      height: 100,
-                      child: NavigationRail(
-                        selectedIndex: 0,
-                        destinations: const <NavigationRailDestination>[
-                          NavigationRailDestination(
-                            icon: Icon(Icons.favorite_border),
-                            selectedIcon: Icon(Icons.favorite),
-                            label: Text('Abc'),
-                          ),
-                          NavigationRailDestination(
-                            icon: Icon(Icons.bookmark_border),
-                            selectedIcon: Icon(Icons.bookmark),
-                            label: Text('Def'),
-                          ),
-                          NavigationRailDestination(
-                            icon: Icon(Icons.star_border),
-                            selectedIcon: Icon(Icons.star),
-                            label: Text('Ghi'),
-                          ),
-                        ],
-                      ),
-                    ),
-                    const Expanded(
-                      child: Text('body'),
-                    ),
-                  ],
-                ),
-              ),
-            );
-          },
-        ),
-      ),
-    );
-
-    final ScrollableState scrollable = tester.state(find.byType(Scrollable));
-    scrollable.position.jumpTo(500.0);
-    expect(scrollable.position.pixels, equals(500.0));
-  });
-
   group('Material 2', () {
     // These tests are only relevant for Material 2. Once Material 2
     // support is deprecated and the APIs are removed, these tests
@@ -5489,11 +5433,10 @@ TestSemantics _expectedSemantics() {
                 flags: <SemanticsFlag>[SemanticsFlag.scopesRoute],
                 children: <TestSemantics>[
                   TestSemantics(
-                    flags: <SemanticsFlag>[SemanticsFlag.hasImplicitScrolling],
-                    children: <TestSemantics>[
-                      TestSemantics(
-                        flags: <SemanticsFlag>[SemanticsFlag.isSelected,
-                          SemanticsFlag.isFocusable],
+                    flags: <SemanticsFlag>[
+                      SemanticsFlag.isSelected,
+                      SemanticsFlag.isFocusable,
+                    ],
                     actions: <SemanticsAction>[SemanticsAction.tap],
                     label: 'Abc\nTab 1 of 4',
                     textDirection: TextDirection.ltr,
@@ -5516,8 +5459,6 @@ TestSemantics _expectedSemantics() {
                     label: 'Jkl\nTab 4 of 4',
                     textDirection: TextDirection.ltr,
                   ),
-                    ],
-                  ),
                   TestSemantics(
                     label: 'body',
                     textDirection: TextDirection.ltr,