e2e: Improve preview menu selector

[heavyweight]

The preview button selector needs to be updated to work for roles menuitem and menuitemradio to improve the e2e tests.

Related to #
#92945

Proposed Changes

• Update preview button selector

Why are these changes being made?

• To have a fix for the nightly build e2e tests

Testing Instructions

Running these should pass:

VIEWPORT_NAME="desktop" ATOMIC_VARIATION="default" TEST_ON_ATOMIC="true" GUTENBERG_EDGE=true yarn workspace wp-e2e-tests test test/e2e/specs/editor/editor__post-basic-flow.ts

TEST_ON_ATOMIC=true GUTENBERG_NIGHTLY=true yarn workspace wp-e2e-tests debug test/e2e/specs/editor/editor__post-basic-flow.ts

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

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