Update generate_data.py to capture context key

[aakankshaduggal]

The key for context is seed_context but we were looking for context, that was just resulting in all grounded skills to take the freeform workflow instead. With this change, it is getting the seed_context and using the grounded workflow when generating data.

Addresses #97

[russellb]

I think we should make pipelines have to explicitly define their input expectations.

1. It would be easier to integrate with. This has happened a few times.
2. We can provide much better error handling to make this sort of thing super clear when it happens.

[russellb]

I think we should make pipelines have to explicitly define their input expectations.

1. It would be easier to integrate with. This has happened a few times.
2. We can provide much better error handling to make this sort of thing super clear when it happens.

to be clear, I wasn't suggesting that has to be done for this PR. It was more comments for the future (I actually thought I was looking at an issue instead of a PR at first!)

[russellb]

thanks! good catch