Epic #70575: Extract Extensions into TER
Provide UpdateWizard for mediace
After ext:mediace will be moved to TER, we need an update wizard in place, that is able to activate it in case some plugins are placed in the instance that is on verge to be upgraded.
The wizard will act offline, so the user will need to make sure, the extension is available. This is due to the fact, that we can not be sure an internet connection exists.