Add README for MCO Operator disruptive e2e tests

[ngopalak-redhat]

This README provides instructions for running disruptive e2e tests for the MCO Operator, including periodic jobs and manual execution on a cluster.

- What I did

Small readme change to help users run MCO disruptive tests. Its not a complete readme for the e2e tests. I expect sometime in the future this readme will improve.

- How to verify it

I used this process and it worked

- Description for the changelog

[openshift-ci]

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[ngopalak-redhat]

/retest-required

[isabella-janssen]

This directory does contain the MCO's e2e tests, but a few different types. The tests in https://github.com/openshift/machine-config-operator/tree/main/test/extended & https://github.com/openshift/machine-config-operator/tree/main/test/extended-priv both have disruptive payload tests and many of the tests in the other directories run as presubmits on PRs. I think it would be most helpful to have one overarching README in this directory that details the different types of tests in different sections below.

I think it could be fair for us to let this README merge to give some background on how to run these tests & team MCO can come back and enhance it as a tech debt item.

I can make a tech debt card tomorrow AM, but tentatively I think some of the updates needed are:

• Running tests from the MCO repo
• Where to find all the job names
• Filling in the objective section as you noted
• Adding details on the other test types

[ngopalak-redhat]

Thanks @isabella-janssen! This README is a starting point to help Node team members (and likely other teams making changes to MCO) run MCO disruptive tests on their PRs. As of today, these are the only tests that restart the node with different kubelet configs. With this Readme in place I can inform my team members to run this test before submitting MCO PRs.

[ngopalak-redhat]

/test all

[openshift-ci]

@ngopalak-redhat: all tests passed!

Full PR test history. Your PR dashboard.

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