Rename `WP_Theme::is_block_based` to `WP_Theme::is_block_theme` and `wp_is_block_template_theme` to `wp_is_block_theme`#2014

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anton-vlasenko:fix/refactor-wp_is_block_template_themeanton-vlasenko/wordpress-develop:fix/refactor-wp_is_block_template_themeCopy head branch name to clipboard