CORE-4584 Remove Singleton AppGroupTreeStoreProvider.

Updated AppsGinModule to no longer use a Singleton AppGroup TreeStore.
Using a Singleton store caused the AppGroup Tree in the ui-pipelines-module to throw exceptions when AppsView#updateAppGroup was called from the main Apps window (such as when updating AppGroup counts).
Removed the AppGroup TreeStore parameter from AppsViewImpl, otherwise it would reference a separate store that its Tree was not using.
Updated AppsViewPresenter#go(HasOneWidget) to call go(HasOneWidget, HasId, HasId), since the categories will no longer be automatically loaded in a Singleton TreeStore for ui-pipelines-module by the Apps window's go(HasOneWidget, HasId, HasId) call.