feat(ui): Indicate preview errors

[flippingbits]

When previewing a pipeline in the UI fails, let the user know and display an error message.

[ChrisRousey]

@flippingbits What type of errors should this be catching? I tested a pipeline, which has a stream-in only containing invalid JSON Objects '{"name":"John", "age":30, "car":null}'. This throws an exception, but the frontend gets stuck in Loading sample records... state

[flippingbits]

This catches errors that happen when previewing a pipeline, for instance, because the request to the python runner has not been successful.

You can test it by setting the number of replicas of the python runner pool to 1 and performing multiple preview requests, e.g., by switching between different steps, within a few seconds.

Good catch, I will add error reporting for your case as well! 🤝

[flippingbits]

@ChrisRousey May I ask you to test your case again?

[flippingbits]

Thanks a lot for the help and feedback :)

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