chore: fix ExtAuthTimeout flaky

[zirain]

xref: https://github.com/envoyproxy/gateway/actions/runs/21911079069/job/63267152635

apply.go:275: 2026-02-11T15:59:29.000006118Z: Creating http-with-http-ext-auth HTTPRoute
    apply.go:275: 2026-02-11T15:59:29.023642378Z: Creating http-ext-auth SecurityPolicy
    apply.go:294: 2026-02-11T15:59:29.043423724Z: Updating envoy-ext-auth-btls BackendTLSPolicy
    apply.go:308: 
        	Error Trace:	/home/runner/go/pkg/mod/sigs.k8s.io/gateway-api@v1.4.1/conformance/utils/kubernetes/apply.go:308
        	            				/home/runner/go/pkg/mod/sigs.k8s.io/gateway-api@v1.4.1/conformance/utils/suite/conformance.go:71
        	            				/home/runner/go/pkg/mod/sigs.k8s.io/gateway-api@v1.4.1/conformance/utils/suite/suite.go:487
        	Error:      	Received unexpected error:
        	            	Operation cannot be fulfilled on backendtlspolicies.gateway.networking.k8s.io "envoy-ext-auth-btls": the object has been modified; please apply your changes to the latest version and try again
        	Test:       	TestE2E/ExtAuthTimeout
        	Messages:   	error updating resource

[netlify]

✅ Deploy Preview for cerulean-figolla-1f9435 canceled.

Name	Link
🔨 Latest commit	51e779f
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.80%. Comparing base (92417ee) to head (51e779f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8255      +/-   ##
==========================================
- Coverage   73.85%   73.80%   -0.05%     
==========================================
  Files         241      241              
  Lines       36609    36609              
==========================================
- Hits        27038    27021      -17     
- Misses       7668     7682      +14     
- Partials     1903     1906       +3     

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