NO-JIRA: Add docs about junits of a monitortest

[hongkailiu]

This is to avoid the mistakes such as #30426

[openshift-ci-robot]

@hongkailiu: This pull request explicitly references no jira issue.

In response to this:

This is to avoid the mistakes such as #30426

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[hongkailiu]

/test e2e-gcp-ovn-upgrade

[wking]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: hongkailiu, wking
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[openshift-ci]

@hongkailiu: 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
ci/prow/e2e-aws-ovn-microshift	23edbc0	link	true	/test e2e-aws-ovn-microshift

Full PR test history. Your PR dashboard.

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