fix(batch_imports): report liveness during job init

[oliverb123]

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PR Summary

This PR adds a liveness check mechanism during batch import job initialization to prevent false unhealthy states when initializing sinks or sources takes extended time.

• Added start_init_liveness_loop function in rust/batch-import-worker/src/main.rs that spawns a background task reporting health every 5 seconds
• Implemented AtomicBool-controlled background task termination using Relaxed memory ordering
• Added liveness reporting before job initialization and cleanup after completion
• Integrated with existing health registry system using HealthHandle for status reporting

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