dashboard/app: don't report more than 3 bugs at once

We started getting lots of the following errors:

Dec 07 07:40: Exceeded soft memory limit of 256 MB with 340 MB after servicing 57 requests total.
	Consider setting a larger instance class in app.yaml. (/api)
Dec 07 07:45: Exceeded soft memory limit of 256 MB with 395 MB after servicing 113 requests total.
	Consider setting a larger instance class in app.yaml. (/api)
Dec 07 07:46: Exceeded soft memory limit of 256 MB with 270 MB after servicing 51 requests total.
	Consider setting a larger instance class in app.yaml. (/api)
Dec 07 07:47: Exceeded soft memory limit of 256 MB with 420 MB after servicing 43 requests total.
	Consider setting a larger instance class in app.yaml. (/api)

This is caused by a sudden spike of bugs that need to be reported.
Number of reported bugs is capped by daily reporting limit,
but it does not seem to be enough.
Cap number of reported bugs explicitly.

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