make it possible to detect version negotiation failures in logging, fix qlogging of those

[marten-seemann]

Fixes #3090.

[codecov]

Codecov Report

Merging #3092 (d468a79) into master (3bce408) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3092      +/-   ##
==========================================
+ Coverage   85.72%   85.73%   +0.01%     
==========================================
  Files         131      131              
  Lines        9520     9532      +12     
==========================================
+ Hits         8161     8172      +11     
- Misses        990      991       +1     
  Partials      369      369              

Impacted Files	Coverage Δ
logging/close_reason.go	100.00% <100.00%> (ø)
qlog/event.go	97.93% <100.00%> (+0.03%)	⬆️
session.go	76.08% <100.00%> (+0.17%)	⬆️
internal/utils/rand.go	62.50% <0.00%> (-12.50%)	⬇️

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