feat: perform child healthiness assessment over a period of time #521
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Fixes #520
Modifications
Added a config parameter to describe the assessment schedule via 3 numerical values: a time delay when to start the assessment, for how long to perform assessments, and how often to assess within the assessment window.
Modified the assessment logic and requeuing logic to reflect the 3 values above based on assessment result. The assessment will stop in case of failure unless a new upgrade version of the rollout is being reconciled.
Verification
Manual tests, E2e tests, and unit tests.
Backward incompatibilities
No issue.