Fixes #4758 Exclude our remove CPCSS script from delay JS

[CrochetFeve0251]

Description

Fix the problem which prevent the id='rocket-critical-css' from being removed on page load by excluding wprRemoveCPCSS from Delay JS.

Fixes #4758

• Bug fix (non-breaking change which fixes an issue)

Is the solution different from the one proposed during the grooming?

No the grooming was right

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Run tests locally
• Check the behavior on my own testing website

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

[engahmeds3ed]

Good job at ur first PR.

Just a small request, we need to update the tests fixtures that we use here: https://github.com/wp-media/wp-rocket/blob/6cfc42e7a1fb9975b2bd32d43199d5dc9fcc12bd/tests/Fixtures/inc/Engine/Optimization/DelayJS/HTML/delayJs.php

to include the following script

<script>
function wprRemoveCPCSS() {
	let preload_stylesheets = document.querySelectorAll( \'link[data-rocket-async="style"][rel="preload"]\' );
	if ( preload_stylesheets && preload_stylesheets.length > 0 ) {
		for ( let stylesheet_index = 0;stylesheet_index < preload_stylesheets.length;stylesheet_index++ ){
			let media = preload_stylesheets[stylesheet_index].getAttribute(\'media\') || \'all\';
			if( window.matchMedia(media).matches ){
				setTimeout( wprRemoveCPCSS, 200 );
				return;
			}
		}
	}

	const elem = document.getElementById( \'rocket-critical-css\' );
	if ( elem && \'remove\' in elem ) {
		elem.remove();
	}
}

if ( window.addEventListener ) {
	window.addEventListener( \'load\', wprRemoveCPCSS );
} else if ( window.attachEvent ) {
	window.attachEvent( \'onload\', wprRemoveCPCSS );
}
</script>

inside the three variables there just before </body>, this will make sure that we don't delay this script anymore.

[engahmeds3ed]

Congratulations, Awesome job

[Mai-Saad]

Working as expected