Update migration to retain 'search' column

Removed the dropping of the 'search' column and its associated index from the migration script.

autogpt_platform/backend/migrations/20260127230419_add_user_workspace/migration.sql

@@ -1,18 +1,6 @@
-/*
-  Warnings:
-
-  - You are about to drop the column `search` on the `StoreListingVersion` table. All the data in the column will be lost.
-
-*/
 -- CreateEnum
 CREATE TYPE "WorkspaceFileSource" AS ENUM ('UPLOAD', 'EXECUTION', 'COPILOT', 'IMPORT');
 
--- DropIndex
-DROP INDEX "UnifiedContentEmbedding_search_idx";
-
--- AlterTable
-ALTER TABLE "StoreListingVersion" DROP COLUMN "search";
-
 -- CreateTable
 CREATE TABLE "UserWorkspace" (
     "id" TEXT NOT NULL,