hab plan render should use render_context_schema when rendering templates

[qubitrenegade]

Per @christophermaier suggestion

Not for this PR, but it would be interesting if we could somehow incorporate in our existing JSON schema definition for templating data into this rendering tool.

I imagine it would be quite useful to know if you've supplied testing data that doesn't actually conform to the data that your templates would actually encounter in the real world.

This should give us more robust debugging capabilities when rendering templates and passing in mock data.

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