fix: handle EventLoopBlockError in CI to fix non-deterministic test failures

[jordanrfrazier]

The run_until_complete function was incorrectly trying to call loop.run_until_complete() on an already running event loop, which causes EventLoopBlockError.

This PR updates the function to run coroutines in a new thread with a separate event loop. That said, this is done for all component executions, so there may be overhead in creating a new thread for component execution.

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