The e2e multi agent workflow tests are failing

[ajbozarth]

Originally posted by @ajbozarth in #438 (comment)

The e2e multi agent workflow tests test_example_execution[workflows/multi_agents.py] and test_multi_agents_workflow_creation are failing.

Any workflow with more than one agent added consistently fails due to RuntimeError: Event loop is closed which causes beeai_framework.agents.errors.AgentError: Maximal amount of global retries (0) has been reached.

This is separate from #441 which is also affecting the workflows/multi_agents.py intermittently

[planetf1]

Also reported in #443