support both CORS pre-flight and CORS requests by default

[coderabbit214]

remove supportCORSRequest and support both CORS pre-flight and CORS requests by default

[codecov-commenter]

Codecov Report

Base: 76.90% // Head: 76.86% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (34116e2) compared to base (ba3c00a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #839      +/-   ##
==========================================
- Coverage   76.90%   76.86%   -0.04%     
==========================================
  Files         103      103              
  Lines       11581    11579       -2     
==========================================
- Hits         8906     8900       -6     
- Misses       2168     2172       +4     
  Partials      507      507              

Impacted Files	Coverage Δ
pkg/filters/corsadaptor/corsadaptor.go	90.32% <ø> (-0.31%)	⬇️
pkg/filters/validator/basicauth.go	78.80% <0.00%> (-1.85%)	⬇️

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