test_loop: add a malicious chunk producer test

[nagisa]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 92.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 70.54%. Comparing base (2375fd7) to head (4fe4f69).
Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
chain/client/src/client_actor.rs	75.00%	0 Missing and 1 partial ⚠️
core/async/src/test_loop.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12795      +/-   ##
==========================================
+ Coverage   70.49%   70.54%   +0.05%     
==========================================
  Files         846      846              
  Lines      174626   174939     +313     
  Branches   174626   174939     +313     
==========================================
+ Hits       123103   123418     +315     
+ Misses      46290    46265      -25     
- Partials     5233     5256      +23     

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (-0.01%)	⬇️
db-migration	0.16% <0.00%> (-0.01%)	⬇️
genesis-check	1.35% <0.00%> (-0.01%)	⬇️
linux	69.13% <95.23%> (+0.23%)	⬆️
linux-nightly	70.17% <92.00%> (+0.08%)	⬆️
pytests	1.64% <0.00%> (-0.01%)	⬇️
sanity-checks	1.46% <0.00%> (-0.01%)	⬇️
unittests	70.38% <92.00%> (+0.05%)	⬆️
upgradability	0.20% <0.00%> (-0.01%)	⬇️

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