[flutter_tools] remove material design schema, use dart code (#69987)

Instead of loading the use-material-design asset data from a yaml file in the repo, leave it in dart code and simplify. Remove some of the globals, but not enough to update to testWithoutContext

packages/flutter_tools/lib/src/build_system/targets/assets.dart

@@ -44,7 +44,10 @@ Future<Depfile> copyAssets(Environment environment, Directory outputDirectory, {
 
   final File pubspecFile =  environment.projectDir.childFile('pubspec.yaml');
   // Only the default asset bundle style is supported in assemble.
-  final AssetBundle assetBundle = AssetBundleFactory.defaultInstance.createBundle();
+  final AssetBundle assetBundle = AssetBundleFactory.defaultInstance(
+    logger: environment.logger,
+    fileSystem: environment.fileSystem,
+  ).createBundle();
   final int resultCode = await assetBundle.build(
     manifestPath: pubspecFile.path,
     packagesPath: environment.projectDir.childFile('.packages').path,

packages/flutter_tools/lib/src/context_runner.dart

@@ -110,7 +110,12 @@ Future<T> runInContext<T>(
         cache: globals.cache,
         platform: globals.platform,
       ),
-      AssetBundleFactory: () => AssetBundleFactory.defaultInstance,
+      AssetBundleFactory: () {
+        return AssetBundleFactory.defaultInstance(
+          logger: globals.logger,
+          fileSystem: globals.fs,
+        );
+      },
       BuildSystem: () => FlutterBuildSystem(
         fileSystem: globals.fs,
         logger: globals.logger,

packages/flutter_tools/schema/material_fonts.yaml

-material:
-  - family: MaterialIcons
-    fonts:
-      - asset: fonts/MaterialIcons-Regular.otf