Rename shell namespace to service_manager

services/service_manager/tests/connect/connect_unittests_manifest.json

 {
   "manifest_version": 1,
   "name": "service:connect_unittests",
   "display_name": "Connect Unittests",
   "capabilities": {
     "provided": {
       "connect_unittests:exposed_interface": [
-        "shell::test::mojom::ExposedInterface"
+        "service_manager::test::mojom::ExposedInterface"
       ]
     },
     "required": {
       "service:connect_test_package": [
         "connect_unittests:connect_test_service"
       ],
       "service:connect_test_app": [
         "connect_unittests:connect_test_service",
         "connect_unittests:standalone_app",
         "connect_unittests:user_id_test"
       ],
       "exe:connect_test_driver": [
         "connect_unittests:client_process_test"
       ],
       "service:connect_test_a": [
         "connect_unittests:connect_test_service",
         "connect_unittests:standalone_app",
         "connect_unittests:user_id_test"
       ],
       "service:shell": [ "shell:instance_name", "shell:user_id" ]
     }
   }
 }