Fix double compress when compression enabled and compressed file exists (#8014)

[bdraco]

(cherry picked from commit 92655a5)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fca5a7a) 97.32% compared to head (cd5261f) 97.39%.

Additional details and impacted files

@@            Coverage Diff             @@
##              3.9    #8017      +/-   ##
==========================================
+ Coverage   97.32%   97.39%   +0.06%     
==========================================
  Files         108      108              
  Lines       32474    32493      +19     
  Branches     3845     3845              
==========================================
+ Hits        31604    31645      +41     
+ Misses        664      646      -18     
+ Partials      206      202       -4     

Flag	Coverage Δ
CI-GHA	97.30% <100.00%> (+0.06%)	⬆️
OS-Linux	96.99% <100.00%> (+0.06%)	⬆️
OS-Windows	94.48% <100.00%> (+<0.01%)	⬆️
OS-macOS	96.81% <100.00%> (+0.29%)	⬆️
Py-3.10.11	94.37% <100.00%> (+<0.01%)	⬆️
Py-3.10.13	96.77% <100.00%> (+<0.01%)	⬆️
Py-3.11.7	96.53% <100.00%> (+0.03%)	⬆️
Py-3.12.1	96.58% <100.00%> (+0.03%)	⬆️
Py-3.8.10	94.35% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	96.70% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	94.37% <100.00%> (+<0.01%)	⬆️
Py-3.9.18	96.75% <100.00%> (+0.03%)	⬆️
Py-pypy7.3.14	96.30% <100.00%> (?)
VM-macos	96.81% <100.00%> (+0.29%)	⬆️
VM-ubuntu	96.99% <100.00%> (+0.06%)	⬆️
VM-windows	94.48% <100.00%> (+<0.01%)	⬆️

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