fix(server): shard the server-test unit job to stop the intermittent crash (#23009)

## Problem

`server-test` fails intermittently: exit 1 with **no `FAIL` line and no
`Test Suites:/Tests:` summary** — the jest run is aborted mid-way,
before the reporter's `onRunComplete`.

## Root cause

The `test` target runs the entire unit suite (~6,600 tests) in **one
in-band jest process on a single runner VM** (`nx.json` sets
`maxWorkers: 1` for the `ci` configuration). A few minutes in, that
process is killed by an **external `SIGKILL`** — confirmed *not* OOM
(~15 GB free at kill time, no cgroup `oom_kill`) and *not* an in-process
crash (a Node diagnostic report armed with `--report-on-fatalerror` +
`--report-uncaught-exception` writes nothing). The whole-run kill is why
it fails intermittently with no summary. `maxWorkers=2` on one VM still
dies, so the threshold is **per-VM**, not per-process.

## Fix

Shard the unit suite across VMs, the same way `server-integration-test`
already does:

- A `twenty-server` `test:ci` target runs jest directly (so `--shard`
forwards) with `dependsOn: ["^build"]` so the workspace deps are built.
- `server-test` becomes a 4-way matrix; each shard runs a quarter of the
suite, well under the kill threshold.
- `ci-server-status-check` already aggregates `server-test`, so required
checks are unchanged.

Also provides two mocks a completed run needs but the SIGKILL had been
masking in `ApplicationRegistrationService.upsertFromCatalog` unit
tests: the `MetricsService` provider and
`applicationRegistrationRepository.createQueryBuilder`.

packages/twenty-server/src/engine/core-modules/application/application-registration/__tests__/application-registration-upsert-from-catalog.spec.ts

@@ -10,6 +10,7 @@ import { ApplicationEntity } from 'src/engine/core-modules/application/applicati
 import { CacheLockService } from 'src/engine/core-modules/cache-lock/cache-lock.service';
 import { CoreEntityCacheService } from 'src/engine/core-entity-cache/services/core-entity-cache.service';
 import { ServerFileStorageService } from 'src/engine/core-modules/file-storage/services/server-file-storage.service';
+import { MetricsService } from 'src/engine/core-modules/metrics/metrics.service';
 import { WorkspaceEntity } from 'src/engine/core-modules/workspace/workspace.entity';
 
 describe('ApplicationRegistrationService - upsertFromCatalog', () => {
@@ -18,6 +19,7 @@ describe('ApplicationRegistrationService - upsertFromCatalog', () => {
     findOne: jest.Mock;
     save: jest.Mock;
     create: jest.Mock;
+    createQueryBuilder: jest.Mock;
   };
 
   const catalogParams = {
@@ -45,6 +47,13 @@ describe('ApplicationRegistrationService - upsertFromCatalog', () => {
       findOne: jest.fn(),
       save: jest.fn(),
       create: jest.fn((entity) => entity),
+      createQueryBuilder: jest.fn(() => ({
+        update: jest.fn().mockReturnThis(),
+        set: jest.fn().mockReturnThis(),
+        where: jest.fn().mockReturnThis(),
+        andWhere: jest.fn().mockReturnThis(),
+        execute: jest.fn().mockResolvedValue({ affected: 0 }),
+      })),
     };
 
     const module: TestingModule = await Test.createTestingModule({
@@ -82,6 +91,10 @@ describe('ApplicationRegistrationService - upsertFromCatalog', () => {
           provide: CoreEntityCacheService,
           useValue: { invalidate: jest.fn() },
         },
+        {
+          provide: MetricsService,
+          useValue: { incrementCounterBy: jest.fn() },
+        },
       ],
     }).compile();