Fix TestErrorCases to run all tests
Fix TestErrorCases to run all tests

Signed-off-by: John Howard <jhoward@microsoft.com>
Signed-off-by: Vincent Demeester <vincent@sbr.pm>

rewritten from github.com/moby/moby d2c41f06c36dc24b2170fef365563d64cc5bd8ec

tonistiigi/buildkit_poc,tonistiigi/buildkit_poc