[BUGFIX] Remove deprecated methods in ExtensionManagementUtility

Removes methods from ExtensionManagementUtility that were obsoleted
with the switch to LocalConfiguration handling and new cache stuff.
All methods are scheduled for removal in 6.2

Change-Id: Ibbef1a20591f34771a5426f34a48b966eaa44aa8
Resolves: #47824
Releases: 6.2
Reviewed-on: https://review.typo3.org/20412
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn