Use test env logs endpoint only for running test (Azure#25873)

Author: scottaddie

sdk/monitor/Azure.Monitor.Query/README.md

@@ -145,7 +145,7 @@ public class MyLogEntryModel
 ```
 
 ```C# Snippet:QueryLogsAsModels
-var client = new LogsQueryClient(TestEnvironment.LogsEndpoint, new DefaultAzureCredential());
+var client = new LogsQueryClient(new DefaultAzureCredential());
 string workspaceId = "<workspace_id>";
 
 // Query TOP 10 resource groups by event count

sdk/monitor/Azure.Monitor.Query/tests/LogsQueryClientSamples.cs

@@ -119,10 +119,11 @@ public async Task QueryLogsAsModels()
         {
             #region Snippet:QueryLogsAsModels
 
-            var client = new LogsQueryClient(TestEnvironment.LogsEndpoint, new DefaultAzureCredential());
 #if SNIPPET
+            var client = new LogsQueryClient(new DefaultAzureCredential());
             string workspaceId = "<workspace_id>";
 #else
+            var client = new LogsQueryClient(TestEnvironment.LogsEndpoint, new DefaultAzureCredential());
             string workspaceId = TestEnvironment.WorkspaceId;
 #endif