fix(product-assistant): correct exception to stop the async iterator

[skoob13]

Problem

An async iterator must throw the StopAsyncIteration exception instead of a regular StopIteration. Currently, it doesn't happen, so the stream stays open until it gets killed by a timeout (my best guess now). After this fix, I haven't observed this issue locally on the ASGI webserver.

Related Sentry log.

Changes

• Implement a sync to async iterator conversion based on an asgiref implementation.
• Catch StopIteration and raise StopAsyncIteration, so the sync_to_async of asgiref can stop the iterator.

Does this work well for both Cloud and self-hosted?

No

How did you test this code?

Unit tests.

[Twixes]

Let's see in prod

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ GraphRecursionError: Recursion limit of 24 reached without hitting a stop condition. You can increase the limit by set... /api/environments/{parent_lookup_team_id}/conve... View Issue
• ‼️ GraphRecursionError: Recursion limit of 24 reached without hitting a stop condition. You can increase the limit by set... ee.hogai.assistant in _stream View Issue
• ‼️ ValueError: Can only run summarization with a visualization message as the last one in the state ee.hogai.summarizer.nodes in run View Issue
• ‼️ ValueError: Can only run summarization with a visualization message as the last one in the state /api/environments/{parent_lookup_team_id}/conve... View Issue

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