Resolves #3608513: Scheduled collection, settings knobs, --no-store

Amandeep Singhrequested to merge
issue/site_doctor-3608513:3608513-b-cron-scheduling into 1.x

Phase B of the results store: cron scheduling on a configurable interval, disabled_checks + persist_info_findings knobs, CLI persistence with --no-store, and the typed SiteDoctorSettings reader. See the issue summary for the design.

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