feat: GCP Pub/Sub scaler add configurable fallback value when no metric value found #5897
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Added an optional valueIfNull configuration value to the GCP Pub/Sub as also found in the older GCP Stackdriver scaler. This allows for a default fallback value when GCP returns no value for a given metric. This prevents excessive error logging especially when using multiple pubsub scalers with low subscription traffic.
Checklist
Relates to #
#5896
Documentation update