tests: add e2e test for new optional list field

[everettraven]

What this PR does:

Adds a new case to the validchanges e2e test to validate that adding a new optional field to a list is considered a valid change.

Which issue this PR is related to:

Proves #49 is not an issue with the latest changes.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: everettraven

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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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You can:

• Mark this PR as fresh with /remove-lifecycle rotten
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/lifecycle rotten