Code Quality: Remove unused WP_Block_Bindings_Registry::$supported_blocks private member variable.

Developed in #10912

Follow-up to [59080], [57641].

Props soean.
See #64238, #61642.
Fixes #64633.


git-svn-id: https://develop.svn.wordpress.org/trunk@61642 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/wp-includes/class-wp-block-bindings-registry.php

@@ -44,19 +44,6 @@ final class WP_Block_Bindings_Registry {
 		'uses_context',
 	);
 
-	/**
-	 * Supported blocks that can use the block bindings API.
-	 *
-	 * @since 6.5.0
-	 * @var string[]
-	 */
-	private $supported_blocks = array(
-		'core/paragraph',
-		'core/heading',
-		'core/image',
-		'core/button',
-	);
-
 	/**
 	 * Registers a new block bindings source.
 	 *