Embeds: Remove SlideShare embed block variation (#62394).

The oEmbed endpoint for SlideShare is effectively deprecated and throws an error for the majority of slide-decks using the service.

Co-authored-by: peterwilsoncc <peterwilsoncc@git.wordpress.org>
Co-authored-by: swissspidy <swissspidy@git.wordpress.org>
Co-authored-by: ellatrix <ellatrix@git.wordpress.org>
Co-authored-by: talldan <talldanwp@git.wordpress.org>
Co-authored-by: NewYorkerLaura <newyorkerlaura@git.wordpress.org>

packages/block-library/src/embed/variations.js

@@ -259,14 +259,6 @@ const variations = [
 		patterns: [ /^https?:\/\/(www\.)?scribd\.com\/.+/i ],
 		attributes: { providerNameSlug: 'scribd', responsive: true },
 	},
-	{
-		name: 'slideshare',
-		title: 'Slideshare',
-		icon: embedContentIcon,
-		description: __( 'Embed Slideshare content.' ),
-		patterns: [ /^https?:\/\/(.+?\.)?slideshare\.net\/.+/i ],
-		attributes: { providerNameSlug: 'slideshare', responsive: true },
-	},
 	{
 		name: 'smugmug',
 		title: 'SmugMug',