deleteProbe optimization pass

[akleshchev]

deleteProbe takes a dozen milliseconds, that's way too expensive and causes jitter

Test plan

• Verify probes still work.

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[akleshchev]

Added a change that instead of reallocating probes, stores and recycles them.

Should reduce performance impact of probes when agent is moving around the world.

No solid test plan here, just make sure probes still work?