Refactor arena & pool guards and logs

[gavv]

• Instead of more generic "flags" enum, use more specific "guards", so that it's easier to understand the purpose

• Use separate flag for each type of guard

• Extract method that increments failure counter and checks if panics are enabled for a guard

• Use same logging format as in MemoryLimiter

[github-actions[bot]]

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[gavv]

Thanks for review!