Send updated user folder permissions to the API

Integrates the folder permissions form with the updated API endpoint
to store changes in the user folders.

Since user folder permissions are returned in the full list of template
folders for the service we need to invalidate the cache key for it each
time we update user permissions.

tests/app/main/views/test_manage_users.py

@@ -447,6 +447,45 @@ def test_edit_user_permissions(
         fake_uuid,
         SERVICE_ONE_ID,
         permissions=permissions_sent_to_api,
+        folder_permissions=None
+    )
+
+
+def test_edit_user_folder_permissions(
+    client_request,
+    mocker,
+    service_one,
+    mock_get_users_by_service,
+    mock_get_invites_for_service,
+    mock_set_user_permissions,
+    mock_get_template_folders,
+    fake_uuid,
+):
+    service_one['permissions'] = ['edit_folder_permissions']
+    mock_get_template_folders.return_value = [
+        {'id': 'folder-id-1', 'name': 'folder_one', 'parent_id': None, 'users_with_permission': []},
+        {'id': 'folder-id-2', 'name': 'folder_one', 'parent_id': None, 'users_with_permission': []},
+        {'id': 'folder-id-3', 'name': 'folder_one', 'parent_id': 'folder-id-1', 'users_with_permission': []},
+    ]
+    client_request.post(
+        'main.edit_user_permissions',
+        service_id=SERVICE_ONE_ID,
+        user_id=fake_uuid,
+        _data=dict(
+            folder_permissions=['folder-id-1', 'folder-id-3']
+        ),
+        _expected_status=302,
+        _expected_redirect=url_for(
+            'main.manage_users',
+            service_id=SERVICE_ONE_ID,
+            _external=True,
+        ),
+    )
+    mock_set_user_permissions.assert_called_with(
+        fake_uuid,
+        SERVICE_ONE_ID,
+        permissions=set(),
+        folder_permissions=['folder-id-1', 'folder-id-3']
     )
 
 
@@ -508,7 +547,8 @@ def test_edit_user_permissions_including_authentication_with_email_auth_service(
             'manage_templates',
             'manage_service',
             'manage_api_keys',
-        }
+        },
+        folder_permissions=None
     )
     mock_update_user_attribute.assert_called_with(
         str(active_user_with_permissions.id),
@@ -1021,6 +1061,7 @@ def test_edit_user_permissions_page_displays_redacted_mobile_number_and_change_l
     client_request,
     active_user_with_permissions,
     mock_get_users_by_service,
+    mock_get_template_folders,
     service_one,
     mocker
 ):