Remove AndroidModuleLibraryManager and related files (#8778)

This code was never turned on by default (see conditional in
`FlutterStudioStartupActivity`), so I think it is safe to remove. When I
try to turn it on by setting `flutter.android.library.sync` to true in
Help > "Set custom properties", there are additional errors from
reflection classes. I think if we want to implement something to turn on
automatic gradle syncing of Android code etc, it will require a
different approach.

I had to run `./gradlew clean` before being able to build and run (not
sure if that was specific to my system).

This will address a few boxes in
#8764.

Author: helin24

resources/META-INF/studio-contribs.xml

@@ -9,8 +9,6 @@
   <extensions defaultExtensionNs="com.intellij">
     <externalSystemTaskNotificationListener implementation="io.flutter.utils.FlutterExternalSystemTaskNotificationListener"/>
     <postStartupActivity implementation="io.flutter.FlutterStudioStartupActivity"/>
-    <library.type implementation="io.flutter.android.AndroidModuleLibraryType"/>
-    <projectService serviceImplementation="io.flutter.android.AndroidModuleLibraryManager"/>
 
   </extensions>
 

src/io/flutter/FlutterStudioStartupActivity.java

@@ -13,10 +13,8 @@
 import com.intellij.openapi.module.Module;
 import com.intellij.openapi.project.Project;
 import com.intellij.util.concurrency.AppExecutorUtil;
-import io.flutter.android.AndroidModuleLibraryManager;
 import io.flutter.dart.FlutterDartAnalysisServer;
 import io.flutter.logging.PluginLogger;
-import io.flutter.settings.FlutterSettings;
 import io.flutter.utils.AddToAppUtils;
 import io.flutter.utils.AndroidUtils;
 import io.flutter.utils.FlutterModuleUtils;
@@ -41,12 +39,6 @@ private static Void doNonBlockingStartup(@NotNull Project project) {
     // Unset this flag for all projects, mainly to ease the upgrade from 3.0.1 to 3.1.
     // TODO(messick) Delete once 3.0.x has 0 7DA's.
     //FlutterProjectCreator.disableUserConfig(project);
-    // Monitor Android dependencies.
-    FlutterSettings flutterSettings = FlutterSettings.getInstance();
-    if (flutterSettings.isSyncingAndroidLibraries() || System.getProperty("flutter.android.library.sync", null) != null) {
-      // TODO(messick): Remove the flag once this sync mechanism is stable.
-      AndroidModuleLibraryManager.startWatching(project);
-    }
     return null;
   }