fix: Show meaning full error message while creating and email inbox [CW-1312] (#6711)

* chore: Shows error message while creating and email inbox

* chore: Review fixes

---------

Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>

app/javascript/dashboard/store/modules/inboxes.js

@@ -157,8 +157,9 @@ export const actions = {
       sendAnalyticsEvent(channel.type);
       return response.data;
     } catch (error) {
+      const errorMessage = error?.response?.data?.message;
       commit(types.default.SET_INBOXES_UI_FLAG, { isCreating: false });
-      throw new Error(error);
+      throw new Error(errorMessage);
     }
   },
   createWebsiteChannel: async ({ commit }, params) => {