ProfilerDisabler's CPU usage checker calculate the CPU usage by profiler by the average runProfiler time divided by sampling interval.

runProfiler includes time to refreshConfig, submitProfile, sampling, aggregate sample.

RefreshConfig and SubmitProfile get called every report interval (e.g. 5 minutes) while sampling and aggregate sample get called every sampling interval (e.g. 1 second).

To have a better estimation of the cpu overhead; we should consider sampling + aggregate sample separately from refreshConfig + submitProfile.

Sampling + aggregate sample overhead can stick with what CPUUsageChecker is doing now. A separate mechanism should be used for estimating the CPU overhead by submitProfile and refreshConfig