fix: remove one lint exclusion and fix it

Author: Duologic

.lint

@@ -5,4 +5,3 @@ exclusions:
  target-instance-rule:
  panel-title-description-rule:
  panel-units-rule:
- template-datasource-rule:

dashboards/apiserver.libsonnet

@@ -210,7 +210,7 @@ local singlestat = grafana.singlestat;
             value: $._config.datasourceName,
           },
           hide: 0,
-          label: 'Data Source',
+          label: 'Data source',
           name: 'datasource',
           options: [],
           query: 'prometheus',

dashboards/controller-manager.libsonnet

@@ -140,7 +140,7 @@ local singlestat = grafana.singlestat;
             value: $._config.datasourceName,
           },
           hide: 0,
-          label: 'Data Source',
+          label: 'Data source',
           name: 'datasource',
           options: [],
           query: 'prometheus',

dashboards/kubelet.libsonnet

@@ -298,7 +298,7 @@ local statPanel = grafana.statPanel;
             value: $._config.datasourceName,
           },
           hide: 0,
-          label: 'Data Source',
+          label: 'Data source',
           name: 'datasource',
           options: [],
           query: 'prometheus',

dashboards/network-usage/cluster-total.libsonnet

@@ -365,7 +365,7 @@ local annotation = grafana.annotation;
             value: $._config.datasourceName,
           },
           hide: 0,
-          label: 'Data Source',
+          label: 'Data source',
           name: 'datasource',
           options: [],
           query: 'prometheus',

dashboards/network-usage/namespace-by-pod.libsonnet

@@ -362,7 +362,7 @@ local singlestat = grafana.singlestat;
             value: $._config.datasourceName,
           },
           hide: 0,
-          label: 'Data Source',
+          label: 'Data source',
           name: 'datasource',
           options: [],
           query: 'prometheus',

dashboards/network-usage/namespace-by-workload.libsonnet

@@ -391,7 +391,7 @@ local annotation = grafana.annotation;
             value: $._config.datasourceName,
           },
           hide: 0,
-          label: 'Data Source',
+          label: 'Data source',
           name: 'datasource',
           options: [],
           query: 'prometheus',

dashboards/network-usage/pod-total.libsonnet

@@ -261,7 +261,7 @@ local singlestat = grafana.singlestat;
             value: $._config.datasourceName,
           },
           hide: 0,
-          label: 'Data Source',
+          label: 'Data source',
           name: 'datasource',
           options: [],
           query: 'prometheus',

dashboards/network-usage/workload-total.libsonnet

@@ -274,7 +274,7 @@ local annotation = grafana.annotation;
             value: $._config.datasourceName,
           },
           hide: 0,
-          label: 'Data Source',
+          label: 'Data source',
           name: 'datasource',
           options: [],
           query: 'prometheus',

dashboards/persistentvolumesusage.libsonnet

@@ -119,7 +119,7 @@ local gauge = promgrafonnet.gauge;
             value: $._config.datasourceName,
           },
           hide: 0,
-          label: 'Data Source',
+          label: 'Data source',
           name: 'datasource',
           options: [],
           query: 'prometheus',