Remove unnecessary theme supports from functions.php

[kjellr]

WordPress/gutenberg#35593 declares the following by default for all block themes:

add_theme_support( 'post-thumbnails' );
add_theme_support( 'responsive-embeds' );
add_theme_support( 'editor-styles' );
add_theme_support(
	'html5',
	array(
		'style',
		'script',
	)
);
add_theme_support( 'automatic-feed-links' );
add_filter( 'should_load_separate_core_block_assets', '__return_true' );

These no longer need to be included in Twenty Twenty-Two's file.

[juricav]

@kjellr hi, I've made the changes in the file