MGMT-20076: Support external platform in Assisted-installer Kube API

[jgyselov]

📝 Summary

AI UI lib PR: openshift-assisted/assisted-installer-ui#3151

Ticket Summary (Title):

Though https://issues.redhat.com/browse/MGMT-13771 we added the support for OCI and the external platform in the REST API of the Assisted-Installer. We now want this feature to be available in the Kube API of the Assisted-Installer in order to make it available in ACM.

Ticket Link:

https://issues.redhat.com/browse/MGMT-20076

Type of Change:

• 🐞 Bug Fix
• ✨ Feature
• 🔧 Refactor
• 💸 Tech Debt
• 🧪 Test-related
• 📄 Docs

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✅ Checklist

General

• PR title follows the convention (e.g. ACM-12340 Fix bug with...)
• Code builds and runs locally without errors
• No console logs, commented-out code, or unnecessary files
• All commits are meaningful and well-labeled
• All new display strings are externalized for localization (English only)
• (Nice to have) JSDoc comments added for new functions and interfaces

If Feature

• UI/UX reviewed (if applicable)
• All acceptance criteria met
• Unit test coverage added or updated
• Relevant documentation or comments included

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🗒️ Notes for Reviewers

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[openshift-ci]

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[jgyselov]

Included in #5103