[2.4.0] Checkmk Werk 17153 created: Skip unnecessary site activations when editing users

[//]: # (werk v2) # Skip unnecessary site activations when editing users key | value ---------- | --- date | 2024-08-15T06:18:56+00:00 version | 2.4.0b1 class | fix edition | cre component | wato level | 1 compatible | yes Previously, any changes to users required site activations on all existing sites. This created a lot of unnecessary activations where users only exist on certain sites. With this werk, only the sites associated with the changed users require an activation.