OSSM-9322 Istio ambient mode getting started docs

[shreyasiddhartha]

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Change type: Doc update; Update cert-manager doc for OCP cert-manager's supported istio-csr

Doc JIRA: https://issues.redhat.com/browse/OSSM-9322

Fix Version: service-mesh-docs-main and service-mesh-docs-3.1

Doc Preview: https://95032--ocpdocs-pr.netlify.app/openshift-service-mesh/latest/install/ossm-istio-ambient-mode.html

SME Review/QE Review: Peer Review:

[ocpdocs-previewbot]

🤖 Fri Jul 18 12:36:13 - Prow CI generated the docs preview:

https://95032--ocpdocs-pr.netlify.app/openshift-service-mesh/latest/install/ossm-istio-ambient-mode.html

[shreyasiddhartha]

/label service-mesh

[longmuir]

Thanks @shreyasiddhartha, this LGTM!

[shreyasiddhartha]

/label peer-review-needed

[shreyasiddhartha]

/label merge-review-needed

[openshift-ci[bot]]

@shreyasiddhartha: all tests passed!

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[shreyasiddhartha]

/label merge-review-needed

[briandooley]

@shreyasiddhartha Can you make sure that all conversations are resolved in this PR before I merge it?

[briandooley]

/cherrypick service-mesh-docs-3.1

[openshift-cherrypick-robot]

@briandooley: new pull request created: #96351

In response to this:

/cherrypick service-mesh-docs-3.1

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-sigs/prow repository.

[shreyasiddhartha]

/remove-label merge-review-needed