Add supertest scheduler cron workers and local API endpoints that record singleton and all-nodes scheduler executions into synced supertest cases.\n\nThe probe API lets live supertest scenarios start, inspect, and stop scheduler assertions without adding a separate resource.
Add a supertest metrics probe that emits telemetry, configure vmagent sidecars in the Docker e2e stack, and assert the emitted plugin metric reaches synced rollups through the admin API.
Replace the template plugin with a migration-bearing supertest fixture. Add linked Ash resources, reversible migrations, a local-only JSON API for infra scenarios, and host-backed tests covering the plugin contract and API behavior.
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