fix: Negative finishCpu causes stats reporting to fail (#26587)

[han-yan01]

Summary:
finishCpu += operator.getFinishCpu().roundTo(NANOSECONDS);

getFinishCpu has underlying issue that causes finisheCpu to overflow thus resulting in a negative result. This causes exception while reporting query completion event leading to stats not being reported. Fix it by setting finishCpu to max value when it overflows

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