adjust azure frontdoor to use agentless metrics (#1412)

* adjust azure frontdoor to use agentless metrics

* upload json dashboard

* fix azure dashboard when alloy or agentless based on pr feedbacks

* Update csp-mixin/signals/azurefrontdoor.libsonnet

Co-authored-by: v-zhuravlev <v-zhuravlev@users.noreply.github.com>

---------

Co-authored-by: v-zhuravlev <v-zhuravlev@users.noreply.github.com>

Author: yduartep

csp-mixin/azureconfig.libsonnet

@@ -19,7 +19,7 @@
 
     groupLabels: ['job', 'resourceGroup', 'subscriptionName'],
     instanceLabels: ['resourceName'],
-    metricsSource: 'azuremonitor',
+    metricsSource: ['azuremonitor', 'azuremonitor_agentless'],
 
     local importRules(rules) = {
       groups+: std.parseYaml(rules).groups,