Consider dropping the data output target

[lcarva]

The ec validate image command allows dumping the computed policy data via the data output target, e.g.

ec validate image ... --output data

Because of our use of conftest, this creates the need of having to re-compiling the policy data for a second time for each image being validated. (Moving to using OPA directly could make this easier but it would still require some work.)

The data output target is not exposed in our Tekton task. (At some point we did, but this turned out to cause issues due to the large amount of data.)

Do we still need this output target? Is inspecting the workdir created under /tmp just as good for debugging purposes?

Acceptance Criteria

• A decision is made on whether or not to keep the data output target. If removing it, use this issue to remove support. Otherwise, provide the compelling reason(s) for keeping it.