WIP: testing e2e in serving

[houshengbo]

Fixes #

Proposed Changes

Release Note

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: houshengbo

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1228b72) 79.40% compared to head (ea8b03e) 79.40%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1619   +/-   ##
=======================================
  Coverage   79.40%   79.40%           
=======================================
  Files          41       41           
  Lines        1845     1845           
=======================================
  Hits         1465     1465           
  Misses        277      277           
  Partials      103      103           

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[knative-prow]

@houshengbo: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
upgrade-tests_operator_main	ea8b03e	link	true	/test upgrade-tests

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