[grafana] reduce multi-file mount to folder mount #2132

Job	Run time
Test charts	5m 4s
Helm Chart Install Sanity (coredns-updater)	8s
Helm Chart Install Sanity (dcgm-exporter)	8s
Helm Chart Install Sanity (dex-crds)	5s
Helm Chart Install Sanity (empty)	8s
Helm Chart Install Sanity (fuse-csi-driver)	8s
Helm Chart Install Sanity (gpu-feature-discovery)	7s
Helm Chart Install Sanity (iguazio-system)	4s
Helm Chart Install Sanity (mpi-operator)	5s
Helm Chart Install Sanity (node-feature-discovery)	4s
Helm Chart Install Sanity (pod-gpu-metrics-exporter)	4s
Helm Chart Install Sanity (prebaked-registry)	5s
Helm Chart Install Sanity (provazio)	4s
Helm Chart Install Sanity (pvc)	4s
Helm Chart Install Sanity (scaler)	7s
Helm Chart Install Sanity (spark-operator)	6s
Helm Chart Install Sanity (tenant)	8s
Helm Chart Install Sanity (tenant-creator)	6s
Helm Chart Install Sanity (tensorboard)	4s
Helm Chart Install Sanity (v3io-configs)	9s
Helm Chart Install Sanity (v3io-webapi)	4s
Helm Chart Install Sanity (v3iod)	6s
	7m 8s

Provide feedback