Command processing (3/n): Uninstall plugin

Summary:
*Stack summary*: this stack refactors plugin management actions to perform them in a dispatcher rather than in the root reducer (store.tsx) as all of these actions has side effects. To do that, we store requested plugin management actions (install/update/uninstall, star/unstar) in a queue which is then handled by pluginManager dispatcher. This dispatcher then dispatches all required state updates.

*Diff summary*: refactored "uninstall plugin" operation to perform it in pluginManager dispatcher

Reviewed By: mweststrate

Differential Revision: D26166198

fbshipit-source-id: d74a1d690102d9036c6d3d8612d2428f5ecef4e6

desktop/app/src/reducers/index.tsx

@@ -102,7 +102,7 @@ export type State = {
   settingsState: SettingsState & PersistPartial;
   launcherSettingsState: LauncherSettingsState & PersistPartial;
   supportForm: SupportFormState;
-  pluginManager: PluginManagerState & PersistPartial;
+  pluginManager: PluginManagerState;
   healthchecks: HealthcheckState & PersistPartial;
   usageTracking: TrackingState;
   pluginDownloads: PluginDownloadsState;
@@ -159,20 +159,13 @@ export default combineReducers<State, Actions>({
     {
       key: 'plugins',
       storage,
-      whitelist: ['marketplacePlugins'],
+      whitelist: ['marketplacePlugins', 'uninstalledPlugins'],
+      transforms: [setTransformer({whitelist: ['uninstalledPlugins']})],
     },
     plugins,
   ),
   supportForm,
-  pluginManager: persistReducer<PluginManagerState, Actions>(
-    {
-      key: 'pluginManager',
-      storage,
-      whitelist: ['uninstalledPlugins'],
-      transforms: [setTransformer({whitelist: ['uninstalledPlugins']})],
-    },
-    pluginManager,
-  ),
+  pluginManager,
   user: persistReducer(
     {
       key: 'user',