fix: remove potential to panic when validating computeclass create requests

Prior to this PR we had the potential to panic when validating the creation of the public compute class types. This PR addresses that issue and refactors for readbility.

For https://github.com/acorn-io/runtime/issues/2401

Checklist

[X] The title of this PR would make a good line in Acorn's Release Note's Changelog
[X] The title of this PR ends with a link to the main issue being address in parentheses, like: This is a title (#1216). Here's an example
[X] All relevant issues are referenced in the PR description. NOTE: don't use GitHub keywords that auto-close issues
[X] Commits follow contributing guidance
[X] Automated tests added to cover the changes. If tests couldn't be added, an explanation is provided in the Verification and Testing section
[X] Changes to user-facing functionality, API, CLI, and upgrade impacts are clearly called out in PR description
[ ] PR has at least two approvals before merging (or a reasonable exception, like it's just a docs change)

acorn-io / runtime

fix: remove potential to panic when validating computeclass create requests #2403

Checklist