[Debug log level] Print validation build result failure (#17423)

# Introduction
As per title, in order to ease debug
Motivation
https://github.com/twentyhq/twenty/issues/17413#issuecomment-3796168946

packages/twenty-server/src/engine/workspace-manager/workspace-migration/services/workspace-migration-validate-build-and-run-service.ts

@@ -6,6 +6,7 @@ import {
 } from 'twenty-shared/metadata';
 import { isDefined } from 'twenty-shared/utils';
 
+import { TwentyConfigService } from 'src/engine/core-modules/twenty-config/twenty-config.service';
 import { ALL_METADATA_REQUIRED_METADATA_FOR_VALIDATION } from 'src/engine/metadata-modules/flat-entity/constant/all-metadata-required-metadata-for-validation.constant';
 import { createEmptyFlatEntityMaps } from 'src/engine/metadata-modules/flat-entity/constant/create-empty-flat-entity-maps.constant';
 import { AllFlatEntityMaps } from 'src/engine/metadata-modules/flat-entity/types/all-flat-entity-maps.type';
@@ -38,12 +39,18 @@ export class WorkspaceMigrationValidateBuildAndRunService {
   private readonly logger = new Logger(
     WorkspaceMigrationValidateBuildAndRunService.name,
   );
+  private readonly isDebugEnabled: boolean;
 
   constructor(
     private readonly workspaceMigrationRunnerService: WorkspaceMigrationRunnerService,
     private readonly workspaceMigrationBuildOrchestratorService: WorkspaceMigrationBuildOrchestratorService,
     private readonly workspaceCacheService: WorkspaceCacheService,
-  ) {}
+    twentyConfigService: TwentyConfigService,
+  ) {
+    const logLevels = twentyConfigService.get('LOG_LEVELS');
+
+    this.isDebugEnabled = logLevels.includes('debug');
+  }
 
   private async computeAllRelatedFlatEntityMaps({
     allFlatEntityOperationByMetadataName,
@@ -186,6 +193,10 @@ export class WorkspaceMigrationValidateBuildAndRunService {
         });
 
     if (validateAndBuildResult.status === 'fail') {
+      if (this.isDebugEnabled) {
+        this.logger.debug(JSON.stringify(validateAndBuildResult, null, 2));
+      }
+
       return validateAndBuildResult;
     }