[run-instance-commands] Preserve fast slow sequentiality (#19757)

# Introduction
The command was wrongly running all fast and then all slow ignoring
instance commands segment
Leading to 
```ts
1.23.0_AddGlobalObjectContextToCommandMenuItemAvailabilityTypeFastInstanceCommand_1776090711153 executed successfully
[Nest] 32679  - 04/16/2026, 1:21:07 PM     LOG [InstanceCommandRunnerService] 1.23.0_DropWorkspaceVersionColumnFastInstanceCommand_1785000000000 executed successfully
[Nest] 32679  - 04/16/2026, 1:21:07 PM     LOG [InstanceCommandRunnerService] 1.22.0_BackfillWorkspaceIdOnIndirectEntitiesSlowInstanceCommand_1775758621018 executed successfully
[Nest] 32679  - 04/16/2026, 1:21:07 PM     LOG [RunInstanceCommandsCommand] Instance commands completed
```

No prod/self host impact as 1.23 hasn't been released yet

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

@@ -283,10 +283,10 @@ export class UpgradeMigrationService {
     return completedCount === workspaceIds.length;
   }
 
-  async getLastAttemptedInstanceCommandOrThrow(): Promise<{
+  async getLastAttemptedInstanceCommand(): Promise<{
     name: string;
     status: UpgradeMigrationStatus;
-  }> {
+  } | null> {
     const migration = await this.upgradeMigrationRepository
       .createQueryBuilder('migration')
       .select(['migration.name', 'migration.status'])
@@ -304,11 +304,24 @@ export class UpgradeMigrationService {
       .getOne();
 
     if (!migration) {
+      return null;
+    }
+
+    return { name: migration.name, status: migration.status };
+  }
+
+  async getLastAttemptedInstanceCommandOrThrow(): Promise<{
+    name: string;
+    status: UpgradeMigrationStatus;
+  }> {
+    const result = await this.getLastAttemptedInstanceCommand();
+
+    if (!result) {
       throw new Error(
         'No instance command found — the database may not have been initialized',
       );
     }
 
-    return { name: migration.name, status: migration.status };
+    return result;
   }
 }