A tiny first step to have more tooling correctly report
virtual and base document conflicts, as detailed in #7694.
This PR fixes the `opa check` command to report conflicts
of this type when the `-b`/`--bundle` flag is provided. The
bundle flag is required as without that, `opa check` should
only verify policies and not load data at all.
While I was in the `cmd` directory, I got annoyed with how
many of these commands store the same constants for their
`--format` flag, so I decided to fix that too, even if it
wasn't related to what I originally planned to do. I hope
it's not too distracting.
Signed-off-by: Anders Eknert <anders@styra.com>
Sebastian Spaink