Emit AI event when install command is copied (#8206)

Address NuGet/Engineering#3400

Author: joelverhagen

src/NuGetGallery/Scripts/gallery/page-display-package.js

@@ -85,6 +85,11 @@ $(function () {
             setTimeout(function () {
                 copyButton.popover('destroy');
             }, 1000);
+            window.nuget.sendMetric("CopyInstallCommand", 1, {
+                ButtonId: id,
+                PackageId: packageId,
+                PackageVersion: packageVersion
+            });
         });
     }  
 

src/NuGetGallery/Views/Packages/DisplayPackage.cshtml

@@ -1146,6 +1146,8 @@
     </style>
 
     <script type="text/javascript">
+        var packageId = @Html.ToJson(Model.Id);
+        var packageVersion = @Html.ToJson(Model.Version);
         var packageManagers = @Html.ToJson(packageManagers.Select(pm => pm.Id).ToList());
     </script>