Remove oauth provider (#15666)

* Remove oauth provider

This removes the oauth provider functionality from awx. The
oauth2_provider app and all references to it have been removed.
Migrations to delete the two tables that locally overwrote
oauth2_provider tables are included. This change does not include
migrations to delete the tables provided by the oauth2_provider app.

Also not included here are changes to awxkit, awx_collection or the ui.

* Fix linters

* Update migrations after rebase

* Update collection tests for auth changes

The changes in https://github.com/ansible/awx/pull/15554 will cause a
few collection tests to fail, depending on what the test configuration
is. This changes the tests to look for a specific warning rather than
counting the number of warnings emitted.

* Update migration

* Removed unused oauth_scopes references

---------

Co-authored-by: Mike Graves <mgraves@redhat.com>
Co-authored-by: Alan Rominger <arominge@redhat.com>

awx/api/generics.py

@@ -374,12 +374,6 @@ class APIView(views.APIView):
                 kwargs.pop('version')
         return super(APIView, self).dispatch(request, *args, **kwargs)
 
-    def check_permissions(self, request):
-        if request.method not in ('GET', 'OPTIONS', 'HEAD'):
-            if 'write' not in getattr(request.user, 'oauth_scopes', ['write']):
-                raise PermissionDenied()
-        return super(APIView, self).check_permissions(request)
-
 
 class GenericAPIView(generics.GenericAPIView, APIView):
     # Base class for all model-based views.