Block Editor: Remove the Testimonials block pattern.

This ensures we have the same patterns used in the Gutenberg plugin.

Props poena.
See #50550.


git-svn-id: https://develop.svn.wordpress.org/trunk@48335 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/block-patterns.php

@@ -16,7 +16,6 @@ $core_block_patterns = array(
 	'large-header-paragraph',
 	'three-buttons',
 	'quote',
-	'testimonials',
 );
 
 foreach ( $core_block_patterns as $core_block_pattern ) {