refactor(swarm): don't use task_event_buffer_size
for pending connections
#3187
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Description
The task for a pending connection only ever sends one event into this channel: Either a success or a failure. Cloning a sender adds one slot to the capacity of the channel. Hence, we can start this capacity at 0 and have the
cloning
of theSender
take care of properly increasing the capacity.Notes
This is a first step towards #3186 by removing one use of this parameter.Links to any relevant issues
Open Questions
Change checklist
I have made corresponding changes to the documentationI have added tests that prove my fix is effective or that my feature worksA changelog entry has been made in the appropriate crates