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Implements device-specific health check timeouts in the DRA health monitoring system as defined in KEP-4680. This allows DRA drivers to specify custom timeout values for individual devices through the gRPC health API. Changes: - Add HealthCheckTimeout field to state.DeviceHealth struct to store device-specific timeout durations - Add health_check_timeout_seconds field to DeviceHealth proto message in the DRA health gRPC API (v1alpha1) - Update manager.go to extract timeout from gRPC responses and apply DefaultHealthTimeout (30s) when not specified - Handle negative timeout values defensively by logging a warning and falling back to the default timeout - Simplify healthinfo.go by removing redundant fallback logic since timeouts are now always set at creation time - Update tests to include HealthCheckTimeout in test fixtures The timeout behavior is: - Positive values: Use the specified timeout in seconds - Zero or unspecified: Use DefaultHealthTimeout (30 seconds) - Negative values: Log warning and use DefaultHealthTimeout This implementation provides flexibility for DRA drivers to define appropriate health check intervals for different device types while maintaining backward compatibility through sensible defaults. Ref: KEP-4680 (Add Resource Health to Pod Status) Ref: kubernetes/enhancements#5476 Signed-off-by: Carlos Eduardo Arango Gutierrez <eduardoa@nvidia.com>