Werk #8587: Do not longer put baked agents and agent update status into WATO snapshots

The snapshots that WATO automatically creates on {{Activate changes}} do no longer contain the baked agents and information about the agent update status. This was considered a bug, since a replay of a WATO snapshot would also reset the update status. And the baked agent can be very large and produce large snapshots. This made {{Activate changes}} quite slow in some situations.

Note: The WATO snapshots are considered to be configuration snapshots - not a replacement for a real backup!

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