[FIX] bus: never GC during requests

Running the bus garbage collector synchronously during the handling of a
request can stall the request for a very long time.

Instead, we add this step to the existing auto-vacuum scheduled job that
handles this kind of housecleaning. It brings another interesting bonus:
it can be scheduled outside of peak hours, which will avoid blocking other
bus-related transactions (the GC deletes a lot of rows and takes a lot
of exclusive locks in the database)

closes odoo/odoo#28326

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