Fix env not optional + serverless logging (#15186)

Several fixes after discussing with @BOHEUS 
- set applicationManifest env key optional
- fix server local serverless function logging (introduces a new env
variable `SERVERLESS_LOGS_ENABLED` defaulting to false)

packages/twenty-server/src/engine/metadata-modules/serverless-function/jobs/serverless-function-trigger.job.ts

@@ -1,4 +1,4 @@
-import { Logger, Scope } from '@nestjs/common';
+import { Scope } from '@nestjs/common';
 
 import { Process } from 'src/engine/core-modules/message-queue/decorators/process.decorator';
 import { Processor } from 'src/engine/core-modules/message-queue/decorators/processor.decorator';
@@ -16,22 +16,17 @@ export type ServerlessFunctionTriggerJobData = {
   scope: Scope.REQUEST,
 })
 export class ServerlessFunctionTriggerJob {
-  private readonly logger = new Logger(ServerlessFunctionTriggerJob.name);
-
   constructor(
     private readonly serverlessFunctionService: ServerlessFunctionService,
   ) {}
 
   @Process(ServerlessFunctionTriggerJob.name)
   async handle(data: ServerlessFunctionTriggerJobData) {
-    const result =
-      await this.serverlessFunctionService.executeOneServerlessFunction(
-        data.serverlessFunctionId,
-        data.workspaceId,
-        data.payload || {},
-        'draft',
-      );
-
-    this.logger.log(result.logs);
+    await this.serverlessFunctionService.executeOneServerlessFunction(
+      data.serverlessFunctionId,
+      data.workspaceId,
+      data.payload || {},
+      'draft',
+    );
   }
 }

packages/twenty-server/src/engine/metadata-modules/serverless-function/serverless-function.service.ts

@@ -108,6 +108,11 @@ export class ServerlessFunctionService {
       version,
     );
 
+    if (this.twentyConfigService.get('SERVERLESS_LOGS_ENABLED')) {
+      /* eslint-disable no-console */
+      console.log(resultServerlessFunction.logs);
+    }
+
     this.auditService
       .createContext({
         workspaceId,