chore(previews): drop long deprecated registerProvider from IPreview

Signed-off-by: Josh <josh.t.richards@gmail.com>

Author: joshtrichards

lib/public/IPreview.php

@@ -5,8 +5,6 @@
  * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
  * SPDX-License-Identifier: AGPL-3.0-only
  */
-// use OCP namespace for all classes that are considered public.
-// This means that they should be used by apps instead of the internal Nextcloud classes
 
 namespace OCP;
 
@@ -35,19 +33,6 @@ interface IPreview {
 	 */
 	public const MODE_COVER = 'cover';
 
-	/**
-	 * In order to improve lazy loading a closure can be registered which will be
-	 * called in case preview providers are actually requested
-	 *
-	 * @param string $mimeTypeRegex Regex with the mime types that are supported by this provider
-	 * @param ProviderClosure $callable
-	 * @since 8.1.0
-	 * @see \OCP\AppFramework\Bootstrap\IRegistrationContext::registerPreviewProvider
-	 *
-	 * @deprecated 23.0.0 Register your provider via the IRegistrationContext when booting the app
-	 */
-	public function registerProvider(string $mimeTypeRegex, Closure $callable): void;
-
 	/**
 	 * Get all providers
 	 * @return array<string, list<ProviderClosure>>