E2E fixes for Gutenberg v10.5.x

[fullofcaffeine]

Tracking issue: #51997.

[github-actions]

Test live: https://calypso.live/?branch=test/gutenberg-10.5.0-upgrade

[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.

[fullofcaffeine]

Mobile viewport GB E2E failures seem flaky. They are passing for me locally:

HEADLESS=1 GUTENBERG_EDGE=true BROWSERSIZE=mobile ./node_modules/.bin/mocha specs-gutenberg/wp-calypso-gutenberg-page-editor-spec.js


  [WPCOM] Calypso Gutenberg Editor: Pages (mobile)
    Public Pages: @parallel
Logging in as e2eflowtestinggutenbergsimpleedge
      ✓ Can log in (33851ms)
      ✓ Can enter page title, content and image (14959ms)
      ✓ Can launch page preview (4119ms)
      ✓ Can see correct page title in preview (1960ms)
      ✓ Can see correct page content in preview (60ms)
      ✓ Can see the image uploaded in the preview (48ms)
      ✓ Can close page preview (284ms)
      ✓ Can publish and preview published content (4706ms)
      ✓ Can see correct page title
      ✓ Can see correct page content
      ✓ Can see the image uploaded displayed
    Private Pages: @parallel
Logging in as e2eflowtestinggutenbergsimpleedge
      ✓ Can log in (29664ms)
      ✓ Can enter page title and content (7791ms)
      ✓ Can set visibility to private which immediately publishes it (4938ms)
      ✓ Can view content (2664ms)
      ✓ Can view page title as logged in user
      ✓ Can view page content as logged in user
      ✓ Can't view page title or content as non-logged in user (698ms)
    Password Protected Pages: @parallel
      Publish a Password Protected Page
Logging in as e2eflowtestinggutenbergsimpleedge
        ✓ Can log in (29533ms)
        ✓ Can enter page title and content and set to password protected (11778ms)
        ✓ Can publish and view content (6298ms)
        ✓ As a logged in user, With no password entered, Can view page title
        ✓ Can see password field
        ✓ Can't see content when no password is entered
        ✓ With incorrect password entered, Enter incorrect password (1044ms)
        ✓ Can view page title
        ✓ Can see password field
        ✓ Can't see content when incorrect password is entered
        ✓ With correct password entered, Enter correct password (850ms)
        ✓ Can view page title
        ✓ Can't see password field (2029ms)
        ✓ Can see page content
        ✓ As a non-logged in user, Clear cookies (log out) (382ms)
        ✓ With no password entered, Can view page title
        ✓ Can see password field
        ✓ Can't see content when no password is entered
        ✓ With incorrect password entered, Enter incorrect password (718ms)
        ✓ Can view page title
        ✓ Can see password field
        ✓ Can't see content when incorrect password is entered
        ✓ With correct password entered, Enter correct password (754ms)
        ✓ Can view page title
        ✓ Can't see password field (2016ms)
        ✓ Can see page content
    Insert a payment button into a page: @parallel
Logging in as e2eflowtestinggutenbergsimpleedge
      ✓ Can log in (29758ms)
      ✓ Can insert the payment button (8503ms)
      ✓ Can publish and view content (26928ms)
      ✓ Can see the payment button in our published page (5717ms)
      ✓ The payment button in our published page opens a new Paypal window for payment (6067ms)


  49 passing (4m)

[fullofcaffeine]

Closed without merging the fixes yesterday 🤦🏻 ... will run the tests for 10.5.4 and merge this one.

[fullofcaffeine]

Rebased.

[fullofcaffeine]

Had to revert this commit, it looks like some blocks are still using this "deprecated" locator.