Reset stealing loop backoff counter when leaving block time back to stealing loop

[isaevil]

Description

Reset of stealing loop backoff is needed to lower a probability of a worker thread, leaving "block time" idle loop back to stealing loop (someone set arena's pool state to SET), to miss work coming as a result of work propagation. If not reset, it is possible that worker thread might not find any work and instead of trying to pause again it will immediately try to set arena pool state to UNSET.

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• added - required for new features and some bug fixes
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