Backport block editor persisted preferences (refresh)

[ironprogrammer]

Refresh of #3219.

• Adds PHPunit test for new wp_register_persisted_preferences_meta function.
• Validates registration and structure of meta key.

Trac ticket: https://core.trac.wordpress.org/ticket/56467

Props noisysocks costdev talldanwp

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

[talldan]

Props noisysocks costdev talldan

It's talldanwp on wordpress.org. Thanks for adding the tests. 😄

[ockham]

LGTM

Could a Core committer please apply the test variable change, and apply with (with props to noisysocks costdev talldanwp)? 😊

cc/ @audrasjb @hellofromtonya

[hellofromtonya]

Test Report

Env:

• OS: macOS Monterey
• Localhost: wp-env
• Plugins: none
• Theme: TT2
• Browsers: Chrome and Firefox

Tests and Results

All tests will use Chrome and Firefox to check if preferences persist between browsers and on reload in same browser.

Test 1: Posts UI

Changing preferences in one browser:

• should persist in same browser on page load ✅
• should persist in the other browser on page load ✅

Test 2: Site Editor

Changing preferences in one browser:

• should persist in same browser on page load ✅
• should persist in the other browser on page load ✅

Test 3: Should not change other UIs

Changing preferences in Post UI should not change Site Editor preferences ✅

[hellofromtonya]

Works as expected ✅
Meets coding standards ✅
Tests pass ✅
All concerns addressed ✅

Prepping commit

[hellofromtonya]

Committed via https://core.trac.wordpress.org/changeset/54182. Thank you everyone for your contributions!