Add VMs inventory and health dashboards

In this PR we introduce 4 dashboard related to
Virtual Machines:

1. Service Level dashboards - Virtual Machines by Time in Status
2. Inventory dashboards - Virtual Machines Inventory
3. Executive dashboards - Single Cluster View
4. Executive dashboards - Single Virtual Machine View

And update the "ACM - OpenShift Virtualization Overview"
name to "Executive dashboards - Clusters Overview"
and enriched it with additional details.

Also moved all dashboards under the "ACM / OpenShift Virtualization"
folder.

Signed-off-by: Shirly Radco <sradco@redhat.com>

operators/multiclusterobservability/manifests/base/config/metrics_allowlist.yaml

@@ -143,6 +143,20 @@ data:
       - cnv:vmi_status_running:count
       - kubevirt_hyperconverged_operator_health_status
       - kubevirt_hco_system_health_status
+      - kubevirt_vmi_info
+      - kubevirt_vm_running_status_last_transition_timestamp_seconds
+      - kubevirt_vm_non_running_status_last_transition_timestamp_seconds
+      - kubevirt_vm_error_status_last_transition_timestamp_seconds
+      - kubevirt_vm_starting_status_last_transition_timestamp_seconds
+      - kubevirt_vm_migrating_status_last_transition_timestamp_seconds
+      - kubevirt_vmi_memory_available_bytes
+      - kubevirt_vmi_phase_count
+      - kubevirt_vmi_cpu_usage_seconds_total
+      - kubevirt_vmi_network_receive_bytes_total
+      - kubevirt_vmi_network_transmit_bytes_total
+      - kubevirt_vmi_storage_iops_read_total
+      - kubevirt_vmi_storage_iops_write_total
+
     matches:
       - __name__="workqueue_queue_duration_seconds_bucket",job="apiserver"
       - __name__="workqueue_adds_total",job="apiserver"