fix: flaky HTTPRouteMixedProtocols e2e test

[zirain]

revert: #9680

fixed: #9916

xref: kubernetes-sigs/gateway-api#5066

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[zirain]

cc @kkk777-7

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.29%. Comparing base (0008ac8) to head (46baabb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9917      +/-   ##
==========================================
- Coverage   81.29%   81.29%   -0.01%     
==========================================
  Files         263      263              
  Lines       40870    40870              
==========================================
- Hits        33227    33225       -2     
- Misses       7643     7645       +2     

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[kkk777-7]

LGTM, thanks!

[kkk777-7]

I understood that why our e2e tests become flaky recently.

Date	Change	Effect
2026-03-06	#8388 added TimeoutConfig() with RequiredConsecutiveSuccesses = 0	Worked as intended — conformance was on v1.5.x, which had no default for this field
2026-07-13	kubernetes-sigs/gateway-api#5036 added the missing timeout defaults, including RequiredConsecutiveSuccesses (cherry-picked to release-1.6 in kubernetes-sigs/gateway-api#5066)	0 now gets replaced by the default 3
2026-07-17	#9515 bumped Gateway API to v1.6.1	The setting from #8388 was silently reverted suite-wide
2026-08-03	#9647 filed: HTTPRouteMixedProtocols is flaky	First report, 17 days after the bump

[zirain]

I understood that why our e2e tests become flaky recently.

Date Change Effect
2026-03-06 #8388 added TimeoutConfig() with RequiredConsecutiveSuccesses = 0 Worked as intended — conformance was on v1.5.x, which had no default for this field
2026-07-13 kubernetes-sigs/gateway-api#5036 added the missing timeout defaults, including RequiredConsecutiveSuccesses (cherry-picked to release-1.6 in kubernetes-sigs/gateway-api#5066) 0 now gets replaced by the default 3
2026-07-17 #9515 bumped Gateway API to v1.6.1 The setting from #8388 was silently reverted suite-wide
2026-08-03 #9647 filed: HTTPRouteMixedProtocols is flaky First report, 17 days after the bump

there're various bug in release-1.6, see #9802

and kubernetes-sigs/gateway-api#5185 is pending for review.