Expose more health info as well as counts in Apply results

[barney-s]

What this PR does / why we need it:

Expose more health info as well as counts in Apply results
When using applyset as a library we sometimes want more information about the last applied set.
Currently we get boolean (IsHealthy, IsAllApplied).
Having more is useful when consuming this as a library.

[barney-s]

/test pull-declarative-test

[barney-s]

/assign @justinsb

[justinsb]

So these were previously unexported so that we could change the implementation and instead offer higher-level methods (AllApplied, All healthy). What signals do we want to expose? And which objects appear in Objects? One answer could be that we every object in the manifest appears in Objects, and then we populate Applied, Is healthy etc at the object level. But what about objects we are pruning - should they appear in Objects?

I guess the question is ... what do you want to do with this information? Do we have to commit to exposing everything, or can we make more incremental changes?

[barney-s]

We mostly want just the objects. Updated the PR to reflect that. Not exposing the counts anymore. Just the list of object status.

[justinsb]

Looks great now, thanks @barney-s

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: barney-s, justinsb

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [justinsb]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment