Delete AMA extension at start in case its already installed (#3285)

* Update AzureMonitorAgentLinux.py

* Update AzureMonitorAgentLinux.py

* Update AzureMonitorAgentLinux.py

* Update AzureMonitorAgentLinux.py

* Update AzureMonitorAgentLinux.py

* fix indent

* fix indent

microsoft/testsuites/vm_extensions/AzureMonitorAgentLinux.py

@@ -1,6 +1,7 @@
 from typing import Any
 
 from assertpy import assert_that
+from azure.core.exceptions import HttpResponseError
 
 from lisa import (
     Logger,
@@ -52,6 +53,13 @@ class AzureMonitorAgentLinuxExtension(TestSuite):
         # Run VM Extension
         extension = node.features[AzureExtension]
 
+        try:
+            # Delete VM Extension if already present
+            extension.delete("AzureMonitorLinuxAgent")
+        except HttpResponseError as identifier:
+            if any(s in str(identifier) for s in ["was not found"]):
+                log.info("AzureMonitorLinuxAgent is not already installed")
+
         extension_result = extension.create_or_update(
             name="AzureMonitorLinuxAgent",
             publisher="Microsoft.Azure.Monitor",