Merge branch 'next'

* next:
  Factor out the interactions handler in the worker code.
  Document the new connection configuration option.
  [TAV-522] Configure number of network error retries.
  [TAV-522] Handle network level errors (retry).
  Fix the "fail in post run callback" worker test.
  Factor out run creation in the worker.
  Use the latest t2-server client library.
Bump version number.
Update the Changelog.