Currently, `pulumi preview` fails immediately when any resource
definition in a Pulumi app is found to be in violation of a resource
policy. But, users would like `preview` to report as many policy
violations as it can before terminating with an error, so that they can
fix many of them before running `preview` again.
This commit will thus change `pulumi preview` to do this sort of
"batching" for policy violations. The engine will attempt to run the
entire preview step, validating every resource definition with the
relevant known resource policies, before finally reporting an error if
any violations are detected.
Fixespulumi/pulumi-policy#31
ed5b8437d1