feat: create disk with ConfidentialVM_NonPersistedTPM securityType

[fnerdman]

Description

Adds option to create managed disks with ConfidentialVM_NonPersistedTPM securityType. These are required to boot ConfidentialVMs with --os-disk-security-encryption-type set to NonPersistedTPM.

This is more of an issue rather than a PR. The patch fixes deployment on my side, but I won't add changelog and test cases. So this could be used as a precursor to the final PR.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

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Testing Guidelines

• Pull request includes test coverage for the included changes.

[github-actions]

Thank you for your contribution @fnerdman! We will review the pull request and get back to you soon.