[!!!][TASK] Move PackageIcon resolving to package class

The PackageInterface is now stricly
typed, in addition a new method is added
to the interface "PackageInterface->getPackageIcon()"
thus, deprecating the method
ExtensionManagementUtiliy::getExtensionIcon()

Resolves: #102895
Releases: main
Change-Id: Icf64e1a6b932fb9803cc772a233257f7a5fc5fad
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82530


Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>