Compositions: Replace boolean for ResourceStatus.isHealthy with string enum.

[hankfreund]

Change description

Replace boolean for ResourceStatus.isHealthy with string enum per request on PR #2017. The currently supported values are "Healthy" and "Unhealthy".

Tests you have done

Deployed to a KIND cluster and applied a test composition (experiments/compositions/composition/tests/data/TestSimpleDeleteFacade/input.yaml). Described the composition to see the status:

Status:
  Composition Generation:  1
  Composition UID:         f8fa482a-4e35-48b1-b28d-934a5bb7f489
  Conditions:
    Last Transition Time:  2024-06-17T17:51:42Z
    Message:               Evaluated and Applied stages: project
    Reason:                ProcessedAllStages
    Status:                True
    Type:                  Ready
  Generation:              2
  Input Generation:        1
  Stages:
    Project:
      Applied Count:  1
      Last Applied:
        Health:        Healthy
        Kind:          ConfigMap
        Name:          proj-a
        Namespace:     team-a
        Status:        Resource is always ready
        Version:       v1
      Resource Count:  1

• [x] Run make ready-pr to ensure this PR is ready for review.
• [x] Perform necessary E2E testing for changed resources.

[hankfreund]

/assign @barney-s

[barney-s]

/approve /lgtm

Thank you so much @hankfreund

[google-oss-prow[bot]]

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