Account for preload links with fetchpriority=high in analyze-loading-optimization

[westonruter]

The analyze-loading-optimization command doesn't currently account for fetchpriority=high being added for images via preload links:

wpp-research/cli/commands/analyze-loading-optimization.mjs

Lines 418 to 430 in 8163be1

	// Obtain fetchPriorityCount, lcpImageMissingFetchPriority, fetchPriorityInsideViewport, and fetchPriorityOutsideViewport.
	const fetchpriorityHighImages = document.body.querySelectorAll(
	'img[fetchpriority="high"]'
	);
	for ( const img of fetchpriorityHighImages ) {
	analysis.fetchPriorityCount++;
	if ( isElementInViewport( img ) ) {
	analysis.fetchPriorityInsideViewport++;
	} else {
	analysis.fetchPriorityOutsideViewport++;
	}
	}

This is done by the Image Prioritizer plugin especially when the same image is not LCP on mobile and desktop, as in this case adding fetchpriority=high could be incorrect for one or the other.