Move services/shell to services/service_manager

services/service_manager/tests/connect/connect_test_app_a_manifest.json

 {
   "manifest_version": 1,
   "name": "service:connect_test_a",
   "display_name": "Connect Test A",
   "capabilities": {
     "provided": {
       "connect_unittests:connect_test_service": [
         "shell::test::mojom::ConnectTestService"
       ],
       "connect_unittests:standalone_app": [
         "shell::test::mojom::StandaloneApp"
       ],
       "connect_unittests:user_id_test": [ "shell::test::mojom::UserIdTest" ]
     },
     "required": {
       "service:connect_unittests": [ "connect_unittests:exposed_interface" ],
       "service:connect_test_class_app": [ "connect_unittests:class" ]
     }
   }
 }