ui: Add group_by param to default explorer values (#6075)

This adds the  the group_by parameter to DEFAULT_PROFILE_EXPLORER_PARAM_VALUES with splitOnCommas enabled, allowing array values to be handled similarly to other params.

Author: yomete

ui/packages/shared/profile/src/index.tsx

@@ -52,6 +52,9 @@ export const DEFAULT_PROFILE_EXPLORER_PARAM_VALUES: ParamPreferences = {
     defaultValue: 'flamegraph',
     splitOnCommas: true, // This param should split on commas for array values
   },
+  group_by: {
+    splitOnCommas: true,
+  },
 };
 
 export {