ackhandler: reject duplicate packets in ReceivedPacket

[marten-seemann]

Before we process a packet, IsPotentiallyDuplicate is called. This should filter out all duplicates before the reach ReceivedPacket.

This is probably a better fix than #3566. Closes #3566.

[codecov]

Codecov Report

Base: 85.50% // Head: 85.47% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (a178ad6) compared to base (424a663).
Patch coverage: 80.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3568      +/-   ##
==========================================
- Coverage   85.50%   85.47%   -0.04%     
==========================================
  Files         139      139              
  Lines       10244    10246       +2     
==========================================
- Hits         8759     8757       -2     
- Misses       1103     1105       +2     
- Partials      382      384       +2     

Impacted Files	Coverage Δ
internal/ackhandler/received_packet_handler.go	73.13% <66.67%> (-2.62%)	⬇️
internal/ackhandler/received_packet_tracker.go	84.09% <100.00%> (-2.12%)	⬇️

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