Remove hostnames API call since we are already passing hostnames through the API

src/Diagnostics.DataProviders/DataProviders/ISupportObserverDataProvider.cs

@@ -11,7 +11,6 @@ namespace Diagnostics.DataProviders
     {
         Task<dynamic> GetSite(string siteName);
         Task<dynamic> GetSite(string stampName, string siteName);
-        Task<IEnumerable<string>> GetSiteHostNames(string siteName);
         Task<string> GetSiteResourceGroupName(string siteName);
         Task<IEnumerable<Dictionary<string, string>>> GetSitesInResourceGroup(string subscriptionName, string resourceGroupName);
         Task<IEnumerable<Dictionary<string, string>>> GetServerFarmsInResourceGroup(string subscriptionName, string resourceGroupName);

src/Diagnostics.DataProviders/DataProviders/SupportObserverDataProvider.cs

@@ -77,13 +77,6 @@ namespace Diagnostics.DataProviders
             throw new NotImplementedException();
         }
 
-        public async Task<IEnumerable<string>> GetSiteHostNames(string siteName)
-        {
-            var response = await GetObserverResource($"sites/{siteName}/hostnames?api-version=2.0");
-            var hostnames = response.Remove(0, 1).Remove(response.Length - 2, 1).Split(new char[] { ',' });
-            return hostnames;
-        }
-
         public Task<string> GetSiteResourceGroupName(string siteName)
         {
             throw new NotImplementedException();