OSSM-8685 Document migration when cert-manager is used

[gwynnemonahan]

OSSM 3.0 GA

Merge to: https://github.com/openshift/openshift-docs/tree/service-mesh-docs-main
Cherry pick to: https://github.com/openshift/openshift-docs/tree/service-mesh-docs-3.0

This PR is part of the standalone doc set for the OpenShift Service Mesh project.

Version(s):
OSSM 3.0 GA

OSSM 3.0 is moving to stand alone format so it will not be cherry-picked back to OCP core branches.

Issue:
https://issues.redhat.com/browse/OSSM-8685

Link to docs preview:
https://88389--ocpdocs-pr.netlify.app/openshift-service-mesh/latest/migrating/checklists/ossm-migrating-cert-manager-assembly.html

QE review:

• QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Fri Feb 14 01:49:00 - Prow CI generated the docs preview:

https://88389--ocpdocs-pr.netlify.app/
https://88389--ocpdocs-pr.netlify.app/openshift-service-mesh/latest/migrating/checklists/ossm-migrating-cert-manager-assembly.html
https://88389--ocpdocs-pr.netlify.app/openshift-service-mesh/latest/migrating/done/ossm-migrating-complete-assembly.html

[gwynnemonahan]

/retest

[gwynnemonahan]

/retest

[openshift-ci]

@gwynnemonahan: 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/validate-portal	4378d14	link	true	/test validate-portal

Full PR test history. Your PR dashboard.

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[openshift-merge-robot]

PR needs rebase.

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[openshift-bot]

Issues go stale after 90d of inactivity.

Mark the issue as fresh by commenting /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.
Exclude this issue from closing by commenting /lifecycle frozen.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[gwynnemonahan]

Closing PR. Corresponding Jira is attached to other Jiras that handled this content.