E2E: Fix failing tests on Gutenberg RC

[m1r0]

Related to p1729177519243639-slack-CBTN58FTJ

Proposed Changes

• This fixes the failing E2E tests when running on the edge version of Gutenberg: https://teamcity.a8c.com/buildConfiguration/calypso_WPComTests_gutenberg_atomic_nightly_desktop/13537470?buildTab=tests&status=failed.

Testing Instructions

• Set up your test env using this guide.
• To run the test on the edge GB version, get the failing test paths listed here and run GUTENBERG_EDGE=true yarn workspace wp-e2e-tests test -- [test path]. These may be easier ways to run the suite, which I don't know about.
• The PR E2E tests should be passing.

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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https://calypso.live?image=registry.a8c.com/calypso/app:build-122238&env=jetpack

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[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.

[holdercp]

Running the tests caused some flakiness but they passed in CI.

[m1r0]

Thanks for the review @holdercp!

FYI, I've just noticed that this PR is not fixing the mobile tests.

[holdercp]

@m1r0 I saw that this morning. I've fixed them in this PR. If you have the time, I'd love a review.