Add missing controls to flex layouts

[isabel_brison]

Adds missing controls to flex layouts in wp_get_layout_style() for justify-content and vertical alignment options.

Reference:

• ​https://github.com/WordPress/gutenberg/pull/47134

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

Backports changes from ​https://github.com/WordPress/gutenberg/pull/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.

<div class="wp-block-group">
<p class="has-luminous-vivid-amber-background-color has-background">1 </p>



<p class="has-luminous-vivid-amber-background-color has-background">2</p>



<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>
</div>

[hellofromTonya]

Currently reviewing for commit.

[hellofromTonya]

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

​PR 3962 is ready for commit 👍

Committing this now.

[hellofromTonya]

In 55201:

Editor: Add missing controls to flex layouts in wp_get_layout_style().

Adds missing controls to flex layouts in wp_get_layout_style() for justify-content and vertical alignment options.

References:

• ​Gutenberg PR 47134.

Follow-up to [54274].

Props isabel_brison, andrewserong, jameskoster, joen, onemaggie , ndiego.
Fixes #57602.

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