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[];