fix: show backend error message on API channel creation failure (#13855)

app/javascript/dashboard/routes/dashboard/settings/inbox/channels/Api.vue

@@ -57,7 +57,10 @@ export default {
           },
         });
       } catch (error) {
-        useAlert(this.$t('INBOX_MGMT.ADD.API_CHANNEL.API.ERROR_MESSAGE'));
+        useAlert(
+          error.message ||
+            this.$t('INBOX_MGMT.ADD.API_CHANNEL.API.ERROR_MESSAGE')
+        );
       }
     },
   },

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

@@ -220,9 +220,8 @@ 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(errorMessage);
+      return throwErrorMessage(error);
     }
   },
   createWebsiteChannel: async ({ commit }, params) => {