Use post type labels in PostFeaturedImage component

[ocean90]

Description

A post type can register custom labels for featured image support. The current PostFeaturedImage component didn't handle this consistently.

How has this been tested?

A new CPT with custom labels for the featured image :

add_action( 'init', function() {
	register_post_type( 'my-foo', [
		'public'       => true,
		'show_in_rest' => true,
		'supports'     => [ 'title', 'editor', 'thumbnail' ],
		'labels'       => [
			'name'                  => _x( 'Team', 'post type general name', 'my-foo' ),
			'singular_name'         => _x( 'Person', 'post type singular name', 'my-foo' ),
			'featured_image'        => __( 'Photo', 'my-foo' ),
			'set_featured_image'    => __( 'Set photo', 'my-foo' ),
			'remove_featured_image' => __( 'Remove photo', 'my-foo' ),
			'use_featured_image'    => __( 'Use as photo', 'my-foo' ),
		],
	] );
} );

Instead of "Set featured image" the component now prints "Set photo". The title of the media modal now also reflects the featured_image label.

[danielbachhuber]

Restarted the job. Looks like we have an intermittent e2e failure again:

[mtias]

Thanks for the improvement!