fix: oidc authentication endpoint was overwritten by discovered value

[zhaohuabing]

fixes: #7459

[codecov]

Codecov Report

❌ Patch coverage is 64.70588% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.31%. Comparing base (2899416) to head (7adacc2).

Files with missing lines	Patch %	Lines
internal/gatewayapi/securitypolicy.go	64.70%	2 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7460      +/-   ##
==========================================
+ Coverage   72.30%   72.31%   +0.01%     
==========================================
  Files         231      231              
  Lines       34074    34087      +13     
==========================================
+ Hits        24636    24651      +15     
+ Misses       7667     7660       -7     
- Partials     1771     1776       +5     

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