Fix serverless save when name empty (#6720)

- fix serverless function error on save when name empty
- remove useless unique constraint on serverless function names

packages/twenty-server/src/database/typeorm/metadata/migrations/1724423248330-removeServerlessFunctionUniqueConstraint.ts

@@ -0,0 +1,19 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class RemoveServerlessFunctionUniqueConstraint1724423248330
+  implements MigrationInterface
+{
+  name = 'RemoveServerlessFunctionUniqueConstraint1724423248330';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TABLE "metadata"."serverlessFunction" DROP CONSTRAINT "IndexOnNameAndWorkspaceIdUnique"`,
+    );
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TABLE "metadata"."serverlessFunction" ADD CONSTRAINT "IndexOnNameAndWorkspaceIdUnique" UNIQUE ("name", "workspaceId")`,
+    );
+  }
+}