Coding Standards: Remove stale WPThemeReview annotations in Twenty Twenty-One

Remove three `WPThemeReview.CoreFunctionality.FileInclude.FileIncludeFound` annotations. The WPThemeReview standard is not installed in WordPress Core.

I believe these annotations were carried over from the upstream Twenty Twenty-One repository when the theme was imported into Core in 4b90066.

Author: rodrigoprimo

src/wp-content/themes/twentytwentyone/classes/class-twenty-twenty-one-customize.php

@@ -113,7 +113,7 @@ public function register( $wp_customize ) {
 
 			// Background color.
 			// Include the custom control class.
-			require_once get_theme_file_path( 'classes/class-twenty-twenty-one-customize-color-control.php' ); // phpcs:ignore WPThemeReview.CoreFunctionality.FileInclude.FileIncludeFound
+			require_once get_theme_file_path( 'classes/class-twenty-twenty-one-customize-color-control.php' );
 
 			// Register the custom control.
 			$wp_customize->register_control_type( 'Twenty_Twenty_One_Customize_Color_Control' );

src/wp-content/themes/twentytwentyone/classes/class-twenty-twenty-one-dark-mode.php

@@ -137,7 +137,7 @@ public function customizer_controls( $wp_customize ) {
 		}
 
 		// Custom notice control.
-		require_once get_theme_file_path( 'classes/class-twenty-twenty-one-customize-notice-control.php' ); // phpcs:ignore WPThemeReview.CoreFunctionality.FileInclude.FileIncludeFound
+		require_once get_theme_file_path( 'classes/class-twenty-twenty-one-customize-notice-control.php' );
 
 		$wp_customize->add_setting(
 			'respect_user_color_preference_notice',

src/wp-content/themes/twentytwentyone/inc/template-functions.php

@@ -335,7 +335,7 @@ function twenty_twenty_one_get_non_latin_css( $type = 'front-end' ) {
 
 	// Include file if function doesn't exist.
 	if ( ! function_exists( 'twenty_twenty_one_generate_css' ) ) {
-		require_once get_theme_file_path( 'inc/custom-css.php' ); // phpcs:ignore WPThemeReview.CoreFunctionality.FileInclude.FileIncludeFound
+		require_once get_theme_file_path( 'inc/custom-css.php' );
 	}
 
 	// Return the specified styles.