E2E tests: Reserved chars are no longer stripped from data-image-title in WP 6.6+

[tbradsha]

Fix E2E tests that were failing on WP 6.6 due to a change in how reserved chars are handled in attachments:
WordPress/wordpress-develop@2358de1

Why are these changes being made?

Testing Instructions

yarn workspace wp-e2e-tests build
VIEWPORT_NAME="desktop" JETPACK_TARGET="wpcom-deployment" yarn workspace wp-e2e-tests test "test/e2e/specs/blocks/blocks__media.ts"

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• https://wpcalypso.wordpress.com/devdocs/docs/testing/index.md 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]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-111685

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-111685&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-111685&env=a8c-for-agencies

[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.