fix: Fix file collision detection with per-file packagers

[erikgeiser]

This PR fixes #302 by taking per-file packagers into account when detecting file destination collisions.

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[codecov]

Codecov Report

Merging #303 (46900e1) into master (4a81c34) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #303      +/-   ##
==========================================
+ Coverage   70.18%   70.21%   +0.02%     
==========================================
  Files           9        9              
  Lines        1107     1108       +1     
==========================================
+ Hits          777      778       +1     
  Misses        204      204              
  Partials      126      126              

Impacted Files	Coverage Δ
files/files.go	95.83% <100.00%> (+0.05%)	⬆️

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[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.