Fixes 'Outlook Calendar Get' validation and permissions issues

Author: Saurabh7019

src/m365/outlook/commands/calendar/calendar-get.spec.ts

@@ -78,7 +78,8 @@ describe(commands.CALENDAR_GET, () => {
 
   afterEach(() => {
     sinonUtil.restore([
-      request.get
+      request.get,
+      calendarGroup.getUserCalendarGroupByName
     ]);
   });