fix(server): batch upgrade migration inserts to stay under PG param limit (#20588)

## Summary

Prod deploy of v2.5.0 fails with a query failure inserting into
`core.upgradeMigration`:

```
query failed: INSERT INTO "core"."upgradeMigration" ("id", "name", "status", "attempt", "executedByVersion", "errorMessage", "isInitial", "workspaceId", "createdAt")
VALUES (DEFAULT, $1, $2, $3, $4, $5, DEFAULT, $6, DEFAULT),
       (DEFAULT, $7, $8, $9, $10, $11, DEFAULT, $12, DEFAULT),
       ... (continues past $2515) ...
```

### Root cause

`UpgradeMigrationService.recordUpgradeMigration` writes one row per
workspace via a single `repository.save([...rows])` call.
`UpgradeMigrationEntity` has **6 user-provided columns** per row
(`name`, `status`, `attempt`, `executedByVersion`, `errorMessage`,
`workspaceId`), so the multi-row INSERT binds `6 * (1 + N_workspaces)`
parameters.

Postgres' wire protocol caps a single statement at **65,535 bind
parameters** (16-bit count). That gives a hard ceiling of ~10,920 rows
per call. Production has enough workspaces to overflow.

packages/twenty-server/src/engine/core-modules/upgrade/services/upgrade-migration.service.ts

@@ -1,6 +1,7 @@
 import { Injectable } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 
+import chunk from 'lodash.chunk';
 import { isDefined } from 'twenty-shared/utils';
 import { In, IsNull, type QueryRunner, Repository } from 'typeorm';
 
@@ -21,6 +22,8 @@ export type WorkspaceLastAttemptedCommand = {
   isInitial: boolean;
 };
 
+const UPGRADE_MIGRATION_SAVE_BATCH_SIZE = 1000;
+
 @Injectable()
 export class UpgradeMigrationService {
   constructor(
@@ -95,7 +98,7 @@ export class UpgradeMigrationService {
         where: { name, workspaceId: IsNull() },
       });
 
-      await repository.save([
+      const instanceRows = [
         {
           name,
           status,
@@ -112,7 +115,14 @@ export class UpgradeMigrationService {
           workspaceId,
           errorMessage,
         })),
-      ]);
+      ];
+
+      for (const batch of chunk(
+        instanceRows,
+        UPGRADE_MIGRATION_SAVE_BATCH_SIZE,
+      )) {
+        await repository.save(batch);
+      }
 
       return;
     }
@@ -134,7 +144,9 @@ export class UpgradeMigrationService {
       });
     }
 
-    await repository.save(rows);
+    for (const batch of chunk(rows, UPGRADE_MIGRATION_SAVE_BATCH_SIZE)) {
+      await repository.save(batch);
+    }
   }
 
   async markAsWorkspaceInitial({