Draft: Move "Didn't recognize cell, but circ stops here" into heartbeat.

Nick Mathewsonrequested to merge
nickm/tor:log_not_for_us_cells into main

When we looked, this was the third most frequent message at PROTOCOL_WARN, and doesn't actually tell us what to do about it. Now:

  • we just log it at info
  • we log it only once per circuit
  • we report, in the heartbeat, how many times it happens, how many cells it happens with per circuit, and how long these circuits have been alive (on average).

Fixes the final part of #40400 (closed).

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