Better handling of HTTP-sourced files

[pivotaljohn]

Describe the problem/challenge you have
As described here: carvel-dev/kapp#521 (comment) ...

Whenever an HTTP GET is performed, if the response succeeds but is a non-200 result, that response is being read as the contents of the named fail.

Describe the solution you'd like
Whenever there is a non-200 response from the HTTP resource, stop and report that error instead of processing the response given (which will never be the desired resource).

Anything else you would like to add:
This is the exact same issue fixed by: carvel-dev/kapp#523

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