fix(tests): avoid closing storage before shutting down test nodes

[nrainhart]

Description

Started seeing this console errors in tests after merging #3320:

stderr | src/tests/sync.garbageCollection.test.ts > sync after the garbage collector has run > loading a coValue from the sync server that was removed by the garbage collector
Failed to persist batched unsynced CoValue tracking {
  err: SqliteError: attempt to write a readonly database
      at convertError (/Users/guidodorsi/workspace/jazz/node_modules/libsql/index.js:59:12)
      at Statement.run (/Users/guidodorsi/workspace/jazz/node_modules/libsql/index.js:333:13)
      at LibSQLSqliteSyncDriver.run (/Users/guidodorsi/workspace/jazz/packages/cojson/src/tests/testStorage.ts:67:26)
      at SQLiteClient.trackCoValuesSyncState (/Users/guidodorsi/workspace/jazz/packages/cojson/src/storage/sqlite/client.ts:216:17)
      at StorageApiSync.trackCoValuesSyncState (/Users/guidodorsi/workspace/jazz/packages/cojson/src/storage/storageSync.ts:406:19)
      at /Users/guidodorsi/workspace/jazz/packages/cojson/src/UnsyncedCoValuesTracker.ts:153:17
      at new Promise (<anonymous>)
      at UnsyncedCoValuesTracker.flush (/Users/guidodorsi/workspace/jazz/packages/cojson/src/UnsyncedCoValuesTracker.ts:151:12)
      at UnsyncedCoValuesTracker.forcePersist (/Users/guidodorsi/workspace/jazz/packages/cojson/src/UnsyncedCoValuesTracker.ts:113:17)
      at SyncManager.gracefulShutdown (/Users/guidodorsi/workspace/jazz/packages/cojson/src/sync.ts:1154:33) {
    code: 'SQLITE_READONLY_DBMOVED',
    rawCode: 1032
  }
}

They were caused by vitest onTestFinished hooks closing storage before the node shutdown was actually completed (which includes tracking the CoValues' sync state in persistent storage).

---

Note

Ensures test nodes fully flush and persist sync state before storage is closed, preventing readonly DB errors during teardown.

• Make onTestFinished teardown async and await node.gracefulShutdown() in testUtils.ts
• Remove unused vitest and helper imports in sync.garbageCollection.test.ts and sync.test.ts

^{Written by Cursor Bugbot for commit c2b0210. This will update automatically on new commits. Configure here.}

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