PROTON-2401: on_link_closed should be closed when the link is remotel…

[NS-SlaFleur]

trafficstars

…y closed (closing state) and then locally closed (closed state).

https://issues.apache.org/jira/browse/PROTON-2401

[codecov-commenter]

Codecov Report

Merging #323 (f23f1d3) into main (a3d1ef4) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #323   +/-   ##
=======================================
  Coverage   68.66%   68.66%           
=======================================
  Files         351      351           
  Lines       70321    70331   +10     
=======================================
+ Hits        48285    48296   +11     
+ Misses      22036    22035    -1     

Impacted Files	Coverage Δ
python/proton/_handlers.py	71.71% <100.00%> (+0.36%)	:arrow_up:
c/src/core/codec.c	82.15% <0.00%> (-0.35%)	:arrow_down:
c/src/proactor/epoll.c	85.02% <0.00%> (+0.17%)	:arrow_up:
python/tests/proton_tests/common.py	81.50% <0.00%> (+0.86%)	:arrow_up:

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[NS-SlaFleur]

@NS-MNellen will take over this PR if there are any questions.

[astitcher]

Closed in favor of #391