Add skip-if-exists config

[blink1073]

Fixes #1107

[codecov]

Codecov Report

Base: 80.00% // Head: 80.01% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (5cc9c16) compared to base (5965c7f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1108      +/-   ##
==========================================
+ Coverage   80.00%   80.01%   +0.01%     
==========================================
  Files          68       68              
  Lines        8011     8011              
  Branches     1586     1586              
==========================================
+ Hits         6409     6410       +1     
  Misses       1180     1180              
+ Partials      422      421       -1     

Impacted Files	Coverage Δ
jupyter_server/serverapp.py	80.12% <0.00%> (+0.08%)	⬆️

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[blink1073]

    INFO:hatch_jupyter_builder.utils:Skip-if-exists file(s) found
    INFO:hatch_jupyter_builder.utils:Skipping build