scope doctor list doesn't report all available checks

[rubberduck203]

This is the current output of running scope doctor list on the examples directory.

❯ cargo run -- doctor list --working-dir examples
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.22s
     Running `target/debug/scope doctor list --working-dir examples`
Available checks that will run
  Name                          Description                                                 Path
- ScopeDoctorGroup/noop-1       Sleep Test to validate UI                                   /Users/chris.mcclellan/workspace/scope/examples/.scope/many-noops/noop-1.yaml
- ScopeDoctorGroup/noop-2       Sleep test to show UX                                       /Users/chris.mcclellan/workspace/scope/examples/.scope/many-noops/noop-2.yaml
- ScopeDoctorGroup/path-exists  Check your shell for basic functionality                    /Users/chris.mcclellan/workspace/scope/examples/.scope/reference-scripts.yaml
- ScopeDoctorGroup/templated    Silence any app specific MOTDs                              /Users/chris.mcclellan/workspace/scope/examples/.scope/doctor-group-templated.yaml

It does not include any targets that are labeled when-required, e.g. doctor-group-fail.yaml.
https://github.com/oscope-dev/scope/blob/8375e2960cce3741ca0128a58997ce2922c2351d/examples/.scope/doctor-group-fail.yaml#L7

I would expect list to return all available targets, as I may want to run a single target with the only flag.

Perhaps add a column to the output that indicates whether each target is included by default or not?