[APIView] Fix Copilot Review Require Detection when version not available

[AlitzelMendez]

closes: #13722

[Copilot]

Pull request overview

This PR updates the Copilot review gating logic to correctly handle API revisions where packageVersion is missing, so that reviews without a trackable version are not incorrectly blocked by Copilot requirements.

Changes:

• Updated shouldDisableApproval in review-page-options.component.ts to short‑circuit and not disable approval when activeAPIRevision.packageVersion is falsy, aligning behavior with the requirement that Copilot review is only enforceable when a version is available.
• Adjusted the corresponding unit test in review-page-options.component.spec.ts to assert that an empty packageVersion results in shouldDisableApproval returning false, reflecting the new intended behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/dotnet/APIView/ClientSPA/src/app/_components/review-page-options/review-page-options.component.ts	Adds a guard in shouldDisableApproval so Copilot review is not required when packageVersion is missing, ensuring approval is not disabled in that scenario.
src/dotnet/APIView/ClientSPA/src/app/_components/review-page-options/review-page-options.component.spec.ts	Updates the shouldDisableApproval test case to validate that an empty packageVersion no longer disables approval when Copilot review is required.

[tjprescott]

It seems to me if version isn't provided, there's no way we should be able to approve it.