Make upgrade applications batch size a job parameter defaulting to 5 (#23101)

Makes the batch size used when upgrading applications a parameter
instead of a hardcoded constant, defaulting to 5, and lets admins set it
from the upgrade confirmation modal.

Backend:
- `UpgradeApplicationsJobData` gains an optional `batchSize` field,
passed through by `UpgradeApplicationsJob` to the service.
- `ApplicationUpgradeService.upgradeAllApplications` accepts an optional
`batchSize` parameter, defaulting to
`UPGRADE_APPLICATIONS_DEFAULT_BATCH_SIZE = 5` (previously a fixed batch
size of 20). The value is sanitized to a positive integer to avoid an
infinite batching loop.
- The `upgradeRegistrationApplications` admin mutation accepts an
optional `batchSize: Int` argument and forwards it to the job.

Frontend (admin panel):
- The "Upgrade existing installations" confirmation modal now includes a
"Batch size" number input, defaulting to 5, sent with the mutation.
- Updated the admin GraphQL document and generated types.

## Screenshots

Upgrade section on the admin app registration page:

![Upgrade
section](https://raw.githubusercontent.com/twentyhq/twenty/8f6f7b5b87b8218e10f9f8ed8a8b705cf25f22f6/upgrade-section.png)

Confirmation modal with the new batch size input (defaults to 5):

![Upgrade confirmation modal with batch size
input](https://raw.githubusercontent.com/twentyhq/twenty/8f6f7b5b87b8218e10f9f8ed8a8b705cf25f22f6/upgrade-modal-batch-size.png)

---------

Co-authored-by: Martin <martin@twenty.com>

packages/twenty-front/src/modules/settings/admin-panel/apps/graphql/mutations/upgradeRegistrationApplications.ts

@@ -3,9 +3,11 @@ import { gql } from '@apollo/client';
 export const UPGRADE_REGISTRATION_APPLICATIONS = gql`
   mutation UpgradeRegistrationApplications(
     $applicationRegistrationId: String!
+    $batchSize: Int
   ) {
     upgradeRegistrationApplications(
       applicationRegistrationId: $applicationRegistrationId
+      batchSize: $batchSize
     )
   }
 `;