Remove `@ts-check` from SyncManagerTests.js (#18291)

Fix broken CI `project-history-pr-trigger`

GitOrigin-RevId: 3bfa666cbce57628f167567daebdd5ff0e1b1e47

services/project-history/test/unit/js/SyncManager/SyncManagerTests.js

@@ -1,5 +1,3 @@
-// @ts-check
-
 import sinon from 'sinon'
 import { expect } from 'chai'
 import mongodb from 'mongodb-legacy'