ci: don't run vmss-prototype tests for release

[jackfrancis]

Reason for Change:

This PR updates the release github action so that it doesn't run kamino vmss-prototype tests, as they don't seem to work with the multi-platform nodepools cluster config that we use to test.

Issue Fixed:

Credit Where Due:

Does this change contain code from or inspired by another project?

• No
• Yes

If "Yes," did you notify that project's maintainers and provide attribution?

• No
• Yes

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

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