[chore] [exporterhelper] Move shutdown error from queue package

[dmitryax]

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The error is created by the retry sender and used by the queue sender. It doesn't belong to queue package

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (d455bff) 90.57% compared to head (3dea08d) 90.58%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9554      +/-   ##
==========================================
+ Coverage   90.57%   90.58%   +0.01%     
==========================================
  Files         347      347              
  Lines       18244    18247       +3     
==========================================
+ Hits        16524    16529       +5     
+ Misses       1390     1388       -2     
  Partials      330      330              

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[codeboten]

@dmitryax please resolve the conflict

[dmitryax]

@codeboten. done 👍