Collect step run exception info

[schustmi]

Describe changes

This PR implements tracking of exceptions that happen during the step execution. In addition to storing the traceback information, we also try to detect which line in the user step code was the reason that caused this exception, so we can highlight this line (and show the exception inline) in the step code in the dashboard.

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Please ensure you have done the following:

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
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[github-actions]

LLM Finetuning template updates in examples/llm_finetuning have been pushed.

[bcdurak]

I have two general questions as well.

• What do you think about adding this to the metadata of the step run? I am not sure if we should add a DB column just for the exception info.
• Would we need to add something similar for the pipeline runs as well?

[bcdurak]

Right now, this covers the step_instance.call_entrypoint(...) call. Maybe we can keep parallel to the scope of the logs_context. WDYT?

[schustmi]

I want to actually run this right after the user code, as otherwise we might include some stuff from the failure hook etc which is not really the actual cause for the error that caused the step to fail.