fix: update migration to drop invalid fields

packages/prisma/migrations/20240418140819_remove_impossible_field_optional_states/migration.sql

@@ -4,5 +4,8 @@
   - Made the column `recipientId` on table `Field` required. This step will fail if there are existing NULL values in that column.
 
 */
+-- Drop all Fields where the recipientId is null
+DELETE FROM "Field" WHERE "recipientId" IS NULL;
+
 -- AlterTable
 ALTER TABLE "Field" ALTER COLUMN "recipientId" SET NOT NULL;