fix: add type guard for conditionals property in client

Use 'in' operator to properly narrow ActionConfig type before accessing
conditionals property. Some action types (like READ) don't have conditionals,
so we need a type guard to satisfy TypeScript's stricter checking.

Author: Siyasanga

packages/client/src/v2-events/features/workqueues/EventOverview/components/useAllowedActionConfigurations.tsx

@@ -640,7 +640,11 @@ function applyActionConditionalEffects({
       'customActionType' in action ? action.customActionType : undefined
   })
 
-  if (!actionConfig || !actionConfig.conditionals) {
+  if (
+    !actionConfig ||
+    !('conditionals' in actionConfig) ||
+    !actionConfig.conditionals
+  ) {
     return action
   }