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/core-modules/application/types/application.types.ts

@@ -11,21 +11,21 @@ export type PackageJson = {
     npm: string;
     yarn: string;
   };
-  env: Record<
-    string,
-    {
-      key: string;
-      value?: string;
-      description?: string;
-      isSecret: boolean;
-    }
-  >;
+  env?: EnvManifest;
   icon?: string;
   version: string;
   dependencies?: object;
   devDependencies?: object;
 };
 
+export type EnvManifest = Record<string, EnvVariableManifest>;
+
+export type EnvVariableManifest = {
+  value?: string;
+  description?: string;
+  isSecret: boolean;
+};
+
 export type AppManifest = PackageJson & {
   agents: AgentManifest[];
   objects: ObjectManifest[];

packages/twenty-server/src/engine/core-modules/applicationVariable/application-variable.service.ts

@@ -4,6 +4,7 @@ import { isDefined } from 'twenty-shared/utils';
 import { In, Not, Repository } from 'typeorm';
 
 import { ApplicationVariable } from 'src/engine/core-modules/applicationVariable/application-variable.entity';
+import { EnvManifest } from 'src/engine/core-modules/application/types/application.types';
 
 export class ApplicationVariableService {
   constructor(
@@ -28,14 +29,7 @@ export class ApplicationVariableService {
     env,
     applicationId,
   }: {
-    env: Record<
-      string,
-      {
-        value?: string;
-        description?: string;
-        isSecret: boolean;
-      }
-    >;
+    env?: EnvManifest;
     applicationId: string;
   }) {
     if (!isDefined(env)) {

packages/twenty-server/src/engine/core-modules/twenty-config/config-variables.ts

@@ -444,6 +444,15 @@ export class ConfigVariables {
   @CastToUpperSnakeCase()
   SERVERLESS_TYPE: ServerlessDriverType = ServerlessDriverType.LOCAL;
 
+  @ConfigVariablesMetadata({
+    group: ConfigVariablesGroup.ServerlessConfig,
+    description:
+      'Configure whether console logs from serverless functions are displayed in the terminal',
+    type: ConfigVariableType.BOOLEAN,
+  })
+  @IsOptional()
+  SERVERLESS_LOGS_ENABLED: false;
+
   @ConfigVariablesMetadata({
     group: ConfigVariablesGroup.ServerlessConfig,
     description: 'Throttle limit for serverless function execution',