features: add multi-arch feature gate per platform

[r4f4]

Adds a day-0 multi-arch cluster installer feature gate per platform.

AWS: https://issues.redhat.com/browse/OCPSTRAT-1472
Azure: https://issues.redhat.com/browse/OCPSTRAT-1476
GCP: https://issues.redhat.com/browse/OCPSTRAT-1477

[r4f4]

/cc @jeffdyoung

[openshift-ci]

Hello @r4f4! Some important instructions when contributing to openshift/api:
API design plays an important part in the user experience of OpenShift and as such API PRs are subject to a high level of scrutiny to ensure they follow our best practices. If you haven't already done so, please review the OpenShift API Conventions and ensure that your proposed changes are compliant. Following these conventions will help expedite the api review process for your PR.

[r4f4]

Example of usage in the installer: openshift/installer@88ce9a8

[r4f4]

/retest-required

[openshift-ci]

@r4f4: all tests passed!

Full PR test history. Your PR dashboard.

Details

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. I understand the commands that are listed here.

[JoelSpeed]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JoelSpeed, r4f4

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [JoelSpeed]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[openshift-bot]

[ART PR BUILD NOTIFIER]

This PR has been included in build ose-cluster-config-api-container-v4.17.0-202407040842.p0.g01da8e8.assembly.stream.el9 for distgit ose-cluster-config-api.
All builds following this will include this PR.