Fix Azure Monitor API timespan format to use 'Z' for UTC (#1005)

Azure Monitor API requires timespan to use 'Z' suffix for UTC timezone
instead of '+00:00' offset. Changed from datetime.isoformat() to
strftime('%Y-%m-%dT%H:%M:%SZ') to match Azure's expected ISO 8601 format.

This fixes the BadRequest error: "Detected invalid time interval input"
that was occurring in instance_idle and unused_nat_gateway policies.

Files modified:
- cloud_governance/common/clouds/azure/monitor/monitor_management_operations.py
- cloud_governance/policy/helpers/azure/azure_policy_operations.py

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: pragya811

cloud_governance/common/clouds/azure/monitor/monitor_management_operations.py

@@ -81,7 +81,7 @@ def get_resource_metrics(self, resource_id: str, metricnames: str, aggregation:
         if not timespan:
             end_date = datetime.now(tz=timezone.utc)
             start_date = end_date - timedelta(days=UNUSED_DAYS)
-            timespan = f'{start_date.isoformat()}/{end_date.isoformat()}'
+            timespan = f'{start_date.strftime("%Y-%m-%dT%H:%M:%SZ")}/{end_date.strftime("%Y-%m-%dT%H:%M:%SZ")}'
         response = self.__monitor_client.metrics.list(resource_uri=resource_id, timespan=timespan,
                                                       metricnames=metricnames, aggregation=aggregation,
                                                       result_type='Data', interval=interval,

cloud_governance/policy/helpers/azure/azure_policy_operations.py

@@ -199,7 +199,7 @@ def get_cpu_utilization_percentage_metric(self, resource_id: str, days: int = IN
         :rtype:
         """
         start_date, end_date = Utils.get_start_and_end_datetime(days=days)
-        timespan = f'{start_date.isoformat()}/{end_date.isoformat()}'
+        timespan = f'{start_date.strftime("%Y-%m-%dT%H:%M:%SZ")}/{end_date.strftime("%Y-%m-%dT%H:%M:%SZ")}'
         cpu_metrics = self.monitor_operations.get_resource_metrics(resource_id=resource_id,
                                                                    metricnames='Percentage CPU',
                                                                    aggregation='Average',
@@ -218,7 +218,7 @@ def get_network_in_kib_metric(self, resource_id: str, days: int = INSTANCE_IDLE_
         :rtype:
         """
         start_date, end_date = Utils.get_start_and_end_datetime(days=days)
-        timespan = f'{start_date.isoformat()}/{end_date.isoformat()}'
+        timespan = f'{start_date.strftime("%Y-%m-%dT%H:%M:%SZ")}/{end_date.strftime("%Y-%m-%dT%H:%M:%SZ")}'
         network_in_metrics = self.monitor_operations.get_resource_metrics(resource_id=resource_id,
                                                                           metricnames='Network In Total',
                                                                           aggregation='Average',
@@ -238,7 +238,7 @@ def get_network_out_kib_metric(self, resource_id: str, days: int = INSTANCE_IDLE
         :rtype:
         """
         start_date, end_date = Utils.get_start_and_end_datetime(days=days)
-        timespan = f'{start_date.isoformat()}/{end_date.isoformat()}'
+        timespan = f'{start_date.strftime("%Y-%m-%dT%H:%M:%SZ")}/{end_date.strftime("%Y-%m-%dT%H:%M:%SZ")}'
         network_out_metrics = self.monitor_operations.get_resource_metrics(resource_id=resource_id,
                                                                            metricnames='Network Out Total',
                                                                            aggregation='Average',