Delete "GKE Cost Optimization Signals - Bin Packing" dashboard (#1191)

Author: Kenji-H

dashboards/google-kubernetes-engine/README.md

@@ -74,10 +74,3 @@
 |:---------------------|
 |Filename: [gke-tpu-node-pool-status.json](gke-tpu-node-pool-status.json)|
 |This dashboard has charts for the related [Kubernetes metrics](https://cloud.google.com/monitoring/api/metrics_kubernetes), including metrics for the multi-host TPU node pool status and availability.|
-
- 
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-|GKE Cost Optimization Signals - Bin Packing|
-|:---------------------|
-|Filename: [gke-cost-optimization-signals-bin-packing.json](gke-cost-optimization-signals-bin-packing.json)|
-|This dashboard has charts for the related [Kubernetes metrics](https://cloud.google.com/monitoring/api/metrics_kubernetes), including metrics for the cluster bin packing.|