Add layout styles for missing flex controls.

[tellthemachines]

Trac ticket: https://core.trac.wordpress.org/ticket/57602

Backports changes from WordPress/gutenberg#47134.

Can be tested manually by adding the following markup to a post, saving and viewing in the front end. All Row children should have the same height.

<!-- wp:group {"layout":{"type":"flex","flexWrap":"nowrap","verticalAlignment":"stretch"}} -->
<div class="wp-block-group"><!-- wp:paragraph {"backgroundColor":"luminous-vivid-amber"} -->
<p class="has-luminous-vivid-amber-background-color has-background">1 </p>
<!-- /wp:paragraph -->

<!-- wp:paragraph {"backgroundColor":"luminous-vivid-amber"} -->
<p class="has-luminous-vivid-amber-background-color has-background">2</p>
<!-- /wp:paragraph -->

<!-- wp:paragraph {"backgroundColor":"luminous-vivid-amber"} -->
<p class="has-luminous-vivid-amber-background-color has-background">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<!-- /wp:paragraph --></div>
<!-- /wp:group -->

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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.

[hellofromtonya]

• Confirmed this PR includes the PHP code changes from the GB PR ✅
• The sample test code does render all to the same height ✅

This PR is ready for commit 👍

[hellofromtonya]

Committing this now.

[hellofromtonya]

Committed via https://core.trac.wordpress.org/changeset/55201.