tests: fix flaky test_rate_limited_*_flow (#10304)
tests: fix flaky test_rate_limited_*_flow (#10304)

* Reduce job count in test_rate_limited_hybrid_flow

Signed-off-by: tabokie <9573dceb6ead9846c7438fed8e7eb148b78d187d@outlook.com>

* tune up tolerance

Signed-off-by: tabokie <9573dceb6ead9846c7438fed8e7eb148b78d187d@outlook.com>
BusyJay/tikv,BusyJay/tikv,BusyJay/tikv,BusyJay/tikv