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/suites/performanceTests.ts

@@ -126,7 +126,7 @@ export const performanceTestSuite: TestSuite = {
             .select('id')
             .single();
 
-          if (parkError) throw parkError;
+          if (parkError) throw new Error(`Park creation failed: ${parkError.message}`);
           parkId = park.id;
           tracker.track('parks', parkId);
 
@@ -214,7 +214,7 @@ export const performanceTestSuite: TestSuite = {
 
           const modDuration = Date.now() - modStart;
 
-          if (modError) throw modError;
+          if (modError) throw new Error(`Moderator check failed: ${modError.message}`);
 
           // Test is_user_banned function performance
           const banStart = Date.now();
@@ -225,7 +225,7 @@ export const performanceTestSuite: TestSuite = {
 
           const banDuration = Date.now() - banStart;
 
-          if (banError) throw banError;
+          if (banError) throw new Error(`Ban check failed: ${banError.message}`);
 
           // Performance threshold: 200ms for simple functions
           const threshold = 200;