Add a MinTimeToReportBandwidth option; make it 0 for testing networks.

This option changes the time for which a bandwidth measurement period
must have been in progress before we include it when reporting our
observed bandwidth in our descriptors.  Without this option, we only
consider a time period towards our maximum if it has been running
for a full day.  Obviously, that's unacceptable for testing
networks, where we'd like to get results as soon as possible.

For non-testing networks, I've put a (somewhat arbitrary) 2-hour
minimum on the option, since there are traffic analysis concerns
with immediate reporting here.

Closes #40337.

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