[TESTONLY] Exp with gotestsum

[chaodaiG]

/assign chaodaiG
/cc chaodaiG

[knative-prow-robot]

@chaodaiG: GitHub didn't allow me to request PR reviews from the following users: chaodaiG.

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/cc chaodaiG

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[knative-prow-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: chaodaiG
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[knative-prow-robot]

@chaodaiG: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-knative-serving-build-tests	98dc81d	link	/test pull-knative-serving-build-tests

Full PR test history. Your PR dashboard.

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[chaodaiG]

/close

[knative-prow-robot]

@chaodaiG: Closed this PR.

In response to this:

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.