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 (8de4188) 97.37% compared to head (b090467) 97.37%.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #8018   +/-   ##
=======================================
  Coverage   97.37%   97.37%           
=======================================
  Files         108      108           
  Lines       32738    32757   +19     
  Branches     3893     3893           
=======================================
+ Hits        31879    31898   +19     
  Misses        656      656           
  Partials      203      203           

Flag	Coverage Δ
CI-GHA	97.28% <100.00%> (+<0.01%)	⬆️
OS-Linux	96.98% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.49% <100.00%> (+<0.01%)	⬆️
OS-macOS	96.80% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	94.39% <100.00%> (+<0.01%)	⬆️
Py-3.10.13	96.76% <100.00%> (+<0.01%)	⬆️
Py-3.11.7	96.52% <100.00%> (+0.03%)	⬆️
Py-3.12.1	96.43% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	94.37% <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%> (+<0.01%)	⬆️
Py-pypy7.3.14	96.29% <100.00%> (+<0.01%)	⬆️
VM-macos	96.80% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	96.98% <100.00%> (+<0.01%)	⬆️
VM-windows	94.49% <100.00%> (+<0.01%)	⬆️

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