[2.22] Add a mock --custom-namespace option to enable run of MR with custom namespace

Author: dbasunag

conftest.py

@@ -48,7 +48,7 @@ def pytest_addoption(parser: Parser) -> None:
     upgrade_group = parser.getgroup(name="Upgrade options")
     must_gather_group = parser.getgroup(name="MustGather")
     cluster_sanity_group = parser.getgroup(name="ClusterSanity")
-
+    model_registry_group = parser.getgroup(name="Model Registry options")
     # AWS config and credentials options
     aws_group.addoption(
         "--aws-secret-access-key",
@@ -151,6 +151,13 @@ def pytest_addoption(parser: Parser) -> None:
         help="Skip RHOAI/ODH-related resources (DSCI and DSC) checks",
         action="store_true",
     )
+    # Model Registry options
+    model_registry_group.addoption(
+        "--custom-namespace",
+        default=False,
+        action="store_true",
+        help="Indicates if the model registry tests are to be run against custom namespace",
+    )
 
 
 def pytest_cmdline_main(config: Any) -> None: