Summary:
DBTest::ShuttingDownNotBlockStalledWrites is flaky, added new sync point dependency to fix it.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10800

Test Plan: gtest-parallel --repeat=1000 ./db_test --gtest_filter="*ShuttingDownNotBlockStalledWrites"

Reviewed By: jay-zhuang

Differential Revision: D40239116

Pulled By: jay-zhuang

fbshipit-source-id: 8c2d7e7df58f202d287bd9f5c9b60b7eff270d0c