Add NumberOfClonesToDefaultClonePath counter

Add a counter to record the number of times a repository is cloned to
the DefaultClonePath. This will give us an idea of how often users
bother to change this default and what impact it has on usage.

src/GitHub.App/Services/RepositoryCloneService.cs

@@ -135,6 +135,12 @@ namespace GitHub.Services
                     // If it isn't a GitHub URL, assume it's an Enterprise URL
                     await usageTracker.IncrementCounter(x => x.NumberOfEnterpriseClones);
                 }
+
+                if (repositoryPath.StartsWith(DefaultClonePath, StringComparison.OrdinalIgnoreCase))
+                {
+                    // Count the number of times users clone into the Default Repository Location
+                    await usageTracker.IncrementCounter(x => x.NumberOfClonesToDefaultClonePath);
+                }
             }
             catch (Exception ex)
             {

src/GitHub.Exports/Models/UsageModel.cs

@@ -91,6 +91,7 @@ namespace GitHub.Models
             public int NumberOfCloneViewUrlTab { get; set; }
             public int NumberOfGitHubClones { get; set; }
             public int NumberOfEnterpriseClones { get; set; }
+            public int NumberOfClonesToDefaultClonePath { get; set; }
         }
     }
 }