feat: Add health check to watch.stream for silent connection drops (Fixes #2462)

[bakhilin]

• Add _health_check_interval parameter to watch.stream()
• Detect and recover from silent connection drops during control plane upgrades
• Preserve backward compatibility (disabled by default)
• Add comprehensive tests for new functionality

Fixes: #2462

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[bakhilin]

@k8s-ci-bot I have signed the CLA

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