Remove the getExportEstimatedSize method from IMigrator

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

Author: come-nc

lib/public/UserMigration/IMigrator.php

@@ -87,14 +87,6 @@ public function getDescription(): string;
 	 */
 	public function getVersion(): int;
 
-	/**
-	 * Returns an estimate of the exported data size in KiB.
-	 * Should be fast, favor performance over accuracy.
-	 *
-	 * @since 24.0.0
-	 */
-	public function getExportEstimatedSize(IUser $user): int;
-
 	/**
 	 * Checks whether it is able to import a version of the export format for this migrator
 	 * Use $importSource->getMigratorVersion($this->getId()) to get the version from the archive