Adjust stackprof default sampling intervals

What does this MR do?

This adjusts the default sampling intervals for both CPU and object sampling with stackprof:

• sample CPU at 99Hz instead of 100Hz to avoid lockstep sampling
• sample objects at a rate of every 100th (1000 was much too coarse to obtain useful traces since too much slips through the cracks and miss rate was often 98% or more)

This is a developer facing change only.

Does this MR meet the acceptance criteria?

Conformity

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