Add a "pub global run" command.

sdk/lib/_internal/pub/test/global/run/unknown_package_test.dart

Index: sdk/lib/_internal/pub/test/global/run/unknown_package_test.dart
diff --git a/sdk/lib/_internal/pub/test/global/deactivate/unknown_package_test.dart b/sdk/lib/_internal/pub/test/global/run/unknown_package_test.dart
similarity index 83%
copy from sdk/lib/_internal/pub/test/global/deactivate/unknown_package_test.dart
copy to sdk/lib/_internal/pub/test/global/run/unknown_package_test.dart
index 3860c48023c6a04ac6e147f5832370466aff6c07..47878124d9f4d23508cc463765ec0c3e9f623103 100644
--- a/sdk/lib/_internal/pub/test/global/deactivate/unknown_package_test.dart
+++ b/sdk/lib/_internal/pub/test/global/run/unknown_package_test.dart
@@ -13,8 +13,8 @@ main() {
   integration('errors if the package is not activated', () {
     servePackages([]);
 
-    schedulePub(args: ["global", "deactivate", "foo"],
-        error: "No active package foo.",
+    schedulePub(args: ["global", "run", "foo", "bar"],
+        error: startsWith("No active package foo."),
         exitCode: exit_codes.DATA);
   });
 }