[v9.4.x] AzureMonitor: Fix query variable migration (#64982)

AzureMonitor: Fix query variable migration (#63991)

* AzureMonitor: Fix query variable migration

Somehow the query object becomes "unwriteable" post 9.4. To workaround
this I clone the query object before doing any migrations which removes
the immutability and allows the migrations to function as they did.

Fixes #63943

* refactor deepClone out to keep object the same

(cherry picked from commit 3498785184)

Co-authored-by: Adam Simpson <adam@adamsimpson.net>

public/app/plugins/datasource/grafana-azure-monitor-datasource/utils/migrateQuery.ts

@@ -33,7 +33,15 @@ export default function migrateQuery(query: AzureMonitorQuery): AzureMonitorQuer
   }
 
   if (workingQuery.azureLogAnalytics?.resource) {
-    workingQuery = migrateLogsResource(workingQuery);
+    workingQuery = {
+      ...workingQuery,
+      azureLogAnalytics: {
+        ...workingQuery.azureLogAnalytics,
+        resources: [workingQuery.azureLogAnalytics.resource],
+      },
+    };
+
+    delete workingQuery.azureLogAnalytics?.resource;
   }
 
   return workingQuery;
@@ -179,15 +187,3 @@ function migrateResourceGroupAndName(query: AzureMonitorQuery): AzureMonitorQuer
 
   return workingQuery;
 }
-
-function migrateLogsResource(query: AzureMonitorQuery): AzureMonitorQuery {
-  let workingQuery = query;
-
-  if (workingQuery.azureLogAnalytics && workingQuery.azureLogAnalytics.resource) {
-    workingQuery.azureLogAnalytics.resources = [workingQuery.azureLogAnalytics.resource];
-
-    delete workingQuery.azureLogAnalytics.resource;
-  }
-
-  return workingQuery;
-}