Disable database type dropdown when editing model registry (opendatahub-io#6208)

When editing an existing model registry, the database type cannot be
changed as this would be a breaking change to the existing database
configuration. The dropdown is now disabled in edit mode while
remaining editable when creating a new registry.

Signed-off-by: Mike Turley <mike.turley@alum.cs.umass.edu>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: mturley

frontend/src/pages/modelRegistrySettings/CreateModal.tsx

@@ -462,6 +462,7 @@ const CreateModal: React.FC<CreateModalProps> = ({ onClose, refresh, modelRegist
                             dataTestId="mr-database-type"
                             toggleProps={{ id: 'mr-database-type-toggle' }}
                             isFullWidth
+                            isDisabled={!!mr}
                             options={databaseTypeOptions}
                             value={databaseType}
                             onChange={(key) => handleDatabaseTypeChange(key)}

packages/cypress/cypress/tests/mocked/modelRegistrySettings/modelRegistrySettings.cy.ts

@@ -1039,6 +1039,16 @@ describe('EditModelRegistry', () => {
     });
   });
 
+  it('should have database type dropdown disabled when editing', () => {
+    setupMocksForMRSettingAccess({});
+    modelRegistrySettings.visit(true);
+    modelRegistrySettings
+      .findModelRegistryRow('test-registry-1')
+      .findKebabAction('Edit model registry')
+      .click();
+    modelRegistrySettings.findDatabaseTypeDropdown().should('be.disabled');
+  });
+
   it('Shows skeleton, when password is loading', () => {
     setupMocksForMRSettingAccess({ hasDatabasePassword: false });
     modelRegistrySettings.visit(true);