Fix rez.system is_production_rez_install to handle forward slash paths under windows.

[michalfratczak]

This allows to import rez module from paths with forward slashes. The following code printed "False" before the fix:

import sys
sys.path.append('C:/rez_test/Lib/site-packages')
from rez.system import system
print( 'is_production_rez_install', system.is_production_rez_install )

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: michalfratczak / name: Michal (10f3744)
• ✅ login: JeanChristopheMorinPerso / name: Jean-Christophe Morin (9bea979)

[JeanChristopheMorinPerso]

@michalfratczak Can you fix the DCO please? You can follow the instructions at https://github.com/AcademySoftwareFoundation/rez/pull/1899/checks?check_run_id=36186947320.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.28%. Comparing base (21a5735) to head (9bea979).
Report is 15 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1899   +/-   ##
=======================================
  Coverage   59.28%   59.28%           
=======================================
  Files         126      126           
  Lines       17217    17218    +1     
  Branches     3017     3017           
=======================================
+ Hits        10207    10208    +1     
  Misses       6325     6325           
  Partials      685      685           

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[michalfratczak]

@JeanChristopheMorinPerso DCO fixed.