fix: increment metrics.Failures counter on node reconciler evaluation error

[mohanakatari119-bit]

processNodeAgainstAllRules already called recordNodeFailure on evaluation errors but never incremented the metrics.Failures counter, so the node_readiness_failures_total metric was not updated for this path.

Added the missing metrics.Failures.WithLabelValues(rule.Name, "EvaluationError").Inc() call right after recordNodeFailure, matching the pattern used elsewhere in the controller.

The new test covers this path by intercepting Patch on node objects to force an evaluation error, then reading the counter before and after processNodeAgainstAllRules to confirm it incremented.

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