Exclude lines containing specific key from performance message processing

Helpers/HelperGatusToMona.cs

@@ -103,6 +103,8 @@ internal static partial class HelperGatusToMona {
         foreach (string line in lines) {
             if (!line.StartsWith(appSettings.GatusConfiguration.Metric))
                 continue;
+            if (line.Contains(appSettings.GatusConfiguration.Key))
+                continue;
             segments = line.Split('{');
             if (segments.Length != 2)
                 continue;