feat(generator): do not copy *.pyc and __pycache__ files

[RobertCraigie]

Change Summary

This PR updates our copy_tree function to ignore any files with the .pyc extension and any files in a __pycache__ directory.

Checklist

• Unit tests for the changes exist
• Tests pass without significant drop in coverage
• Documentation reflects changes where applicable
• Test snapshots have been updated if applicable

Agreement

By submitting this pull request, I confirm that you can use, modify, copy and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Merging #474 (6b07cc7) into main (7d8dc3a) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #474      +/-   ##
==========================================
+ Coverage   94.20%   94.22%   +0.02%     
==========================================
  Files         117      118       +1     
  Lines        5958     5979      +21     
  Branches      335      335              
==========================================
+ Hits         5613     5634      +21     
  Misses        303      303              
  Partials       42       42              

Impacted Files	Coverage Δ
src/prisma/generator/utils.py	96.61% <100.00%> (ø)
tests/test_generation/test_utils.py	100.00% <100.00%> (ø)

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