Improve error formatting in tests

- Replace [object Object] errors with readable messages by using robust error formatting across test suites
- Introduce formatTestError helper and apply it in all catch blocks and error throws
- Update approvalPipelineTests and related suites to utilize improved error extraction for better debugging

src/lib/integrationTests/helpers/approvalTestHelpers.ts

@@ -8,7 +8,8 @@
 
 import { supabase } from '@/lib/supabaseClient';
 import { TestDataTracker } from '../TestDataTracker';
-import { 
+import { formatTestError } from '../formatTestError';
+import {
   submitParkCreation, 
   submitRideCreation,
   submitManufacturerCreation,
@@ -18,6 +19,9 @@ import {
   submitRideModelCreation
 } from '@/lib/entitySubmissionHelpers';
 
+// Re-export formatTestError for use in test suites
+export { formatTestError } from '../formatTestError';
+
 // ============================================
 // AUTHENTICATION
 // ============================================
@@ -416,7 +420,7 @@ export async function approveSubmission(
     const duration = performance.now() - startTime;
     return {
       success: false,
-      error: error instanceof Error ? error.message : String(error),
+      error: formatTestError(error),
       duration,
     };
   }