hare: Clean up and/or prioritize all old Hare-related issues

[jonZlotnik]

Ready for any Dev

#3138 #1143 Flaky tests: #3079 #2953 #2923

Ready for dev with good understanding of hare

#673 #3287 #1467 #1331

Blocked by ambiguities

i.e. Somebody who knows about the issue's context needs add details. #2544 Genesis flow: #953 #1299 #1311

Requires analysis with sandwich team

#767 #2785 #1652 #1968 #1965

Lower priority

Code quality things #3335 #3334 Probably not relevant anymore: #1259 #1178