Headless mode should fail if CT/CS statements are missing column defs

[big-andy-coates]

Requested by @hjafarpour

Headless mode should not support getting schema from the schema registry at the moment.

Interactive mode gets the schema once and bakes this into the command in the command topic.

We can look at support schema evolution for both headless and interactive later. But for now, with not testing around evolution, we should not allow it in headless mode.

[miguno]

Related: #1530

[big-andy-coates]

Decision made not to implement this, (as it may break existing customers who are carefully managing the evolution of their schemas). The true solution is to support schema inference in headless mode, i.e. #1530.