Werk #12553: Agent bakery: Fix host label conditions in distributed setups

In previous Checkmk versions agent bakery rules that were using host label conditions could not be used correctly in distributed setups.

The background is that in distributed setups the discovered(!) host labels are stored on remote sites for hosts that are assigned with a remote site. But the processing of agent bakery rules is done one the central site during agent baking. Without the discovered host labels of remote site hosts, the bakery could not compute the correct agent configuration for these hosts. The hosts were not matched based on their discovered host labels.

This change now sets up a synchronization of discovered host labels from remote sites to the central site for the bakery rules to be able to match the correct hosts.

The synchronization is being executed on a regular base (every 10 minutes for now) as background job. You can have a look at the state of this synchronization at "Setup > Background jobs > Discovered host label synchronization".

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