[release-4.21] OSDOCS-17769: Add AWS m7 instance types

[openshift-cherrypick-robot]

This is an automated cherry-pick of #10246

/assign yunjiang29

[openshift-ci-robot]

@openshift-cherrypick-robot: Ignoring requests to cherry-pick non-bug issues: OSDOCS-17769

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In response to this:

This is an automated cherry-pick of #10246

/assign yunjiang29

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[openshift-ci]

@openshift-cherrypick-robot: The following tests 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-heterogeneous	9177373	link	false	/test e2e-aws-ovn-heterogeneous
ci/prow/e2e-aws-ovn-edge-zones	9177373	link	false	/test e2e-aws-ovn-edge-zones

Full PR test history. Your PR dashboard.

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[tthvo]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tthvo

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• docs/user/aws/OWNERS [tthvo]

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[tthvo]

We do need an OCPBUGS bug card to satisfy jira requirement, but maybe we can manually add it in?

/cc @patrickdillon