Fix risk profiles exceeding one million

[justinhaaheim]

This fixes #1310 by limiting the calculation in calculatePersonRiskEach to a maximum of one million.

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[oxytocinlove]

Thanks for taking this on! I think we wanted to use the fix in https://microcovid.slack.com/archives/C019MJ8RK45/p1641845839001200 though

[justinhaaheim]

Ah - got it. I'll take a whack at that.

[tkpwaeub]

Ok but please note that this isn't really how probability works. If you roll a million sided die a million times the chance of getting a 19 on one of those rolls is roughly 63% (1-(1/e)) It takes about 4.6 million rolls to clear 99%. I don't see a need for a cap as long as this nuance is explained.