Adding group Db to federation tests and ldap tests

Add group DB to Test_UrlGenerator

Adding group DB to trashbin and versions tests

Adding group DB to Test_Util_CheckServer for pg

In case the update server may deliver malicious content this would allow an adversary to inject arbitrary HTML into the response. So very bad stuff.

While signing the response would be better and something we can also do in the future (considering the code signing work), this is already a good first start.

Added SystemTagManager and SystemTagObjectMapper

This makes it work better with old version of Nginx.

* now uses the proper URLGenerator interface
* add comment about DI problems

* removes OC_Helper::mb_substr_replace and OC_Helper::mb_str_replace
* keeps public interface wrapper working as expected

* ref #4774

Fixes #20648

No injection of userfolders etc. Only generic DI components
(IRootFolder) etc should be used to make sure we can also run this from
the cli

The share manager etc should not care about filtering stuff. They should
return what is asked for them.

To make sure hooks are always fired and child entries are always
cleaned. This logic is moved to the share manager.

* Updated unit tests