Wrap diagnostic logging in debug conditional to avoid unnecessary str…

…ing construction for unlogged messages in non-development environments (was notice while exploring options for using FeatureGate attribute from feature management library to disable controllers -- to no avail).

Application/EdFi.Ods.Common/Models/Graphs/BidirectionalGraphExtensions.cs

@@ -28,7 +28,11 @@ public static IReadOnlyList<Cycle<TVertex>> GetCycles<TVertex, TEdge>(
             // Call the recursive helper function to detect cycle in different DFS trees
             foreach (var vertex in graph.Vertices)
             {
-                _logger.Debug($"Probing node '{vertex}' for cyclical dependencies...");
+                if (_logger.IsDebugEnabled)
+                {
+                    _logger.Debug($"Probing node '{vertex}' for cyclical dependencies...");
+                }
+
                 graph.FindCycles(vertex, visited, stack, cycles);
             }