Fix code scanning alert no. 40: Log entries created from user input

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Udap.Common/Metadata/UdapMetaDataBuilder.cs

@@ -101,7 +101,8 @@ public string GetCommunitiesAsHtml(string path)
 
         if (certificate == null)
         {
-            _logger.LogWarning("Missing default community certificate: {Community}", System.Web.HttpUtility.UrlEncode(community));
+            var sanitizedCommunity = System.Web.HttpUtility.UrlEncode(community).Replace(Environment.NewLine, "").Replace("\n", "").Replace("\r", "");
+            _logger.LogWarning("Missing default community certificate: {Community}", sanitizedCommunity);
             return null;
         }