Evaluate Refactoring of Boards::Lists::UpdateService

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EE::Boards::List::UpdateService takes care of updating several attributes on a list, e.g.:

• position
• user preferences
• max limits (EE)

@reprazent suggested to collect all the attributes and update the List in one step.

One issue we might face during this refactoring is Boards::Lists::MoveService which updates the position and needs a lock on the list. We might need to move the lock to a higher level (UpdateService?) instead.

Relevant discussions:

• !19220 (comment 247558783)
• !15116 (comment 217723334)