Existing IT only exercises the startContainer-throws path, where the
exception bypasses the entire try block. Add a test where startContainer
succeeds but getContainerStatus never returns healthy — this covers the
early-exit at the HEALTH_CHECK stage, which is the common real-world
failure shape and closest to the snapshot-write point.
Shortens healthchecktimeout to 2s via @TestPropertySource so the test
completes in a few seconds.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>