fix: Force disable "warnings as errors" flag for CL preprocessing

[AJIOB]

Fix #2250

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 51.66%. Comparing base (0cc0c62) to head (e2d1eaf).
Report is 72 commits behind head on main.

Files with missing lines	Patch %	Lines
src/compiler/msvc.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2251       +/-   ##
===========================================
+ Coverage   30.91%   51.66%   +20.74%     
===========================================
  Files          53       54        +1     
  Lines       20112    20708      +596     
  Branches     9755     9781       +26     
===========================================
+ Hits         6217    10698     +4481     
- Misses       7922     8023      +101     
+ Partials     5973     1987     -3986     

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[sylvestre]

LGTM, thanks