Fetch replication status with the 'fork' start method

Python 3.14 changed multiprocessing's default start method on Unix from
'fork' to 'forkserver'. The child no longer inherits the licensing handler
registry, which is filled at runtime, so building the automation request
headers raised KeyError(Edition...). The distributed monitoring page showed
that repr as the configuration connection status of every remote site.

CMK-37829

Change-Id: I167a8b8051af57afb1310fd8eb4eab574317305a