Fixed test data for import_unity_package

`:testImportUnityPackage` failed because the `contents.txt` missed some
items. Updated the test data so that the test can pass.

Author: chkuang-g

source/ImportUnityPackage/test_data/external-dependency-manager-1.2.144.unitypackage.contents.txt

@@ -22,6 +22,8 @@ Assets/ExternalDependencyManager/Editor/Google.VersionHandlerImpl_v1.2.144.dll
 Assets/ExternalDependencyManager/Editor/Google.VersionHandlerImpl_v1.2.144.dll.mdb
 Assets/ExternalDependencyManager/Editor/Google.VersionHandlerImpl_v1.2.144.dll.mdb.meta
 Assets/ExternalDependencyManager/Editor/Google.VersionHandlerImpl_v1.2.144.dll.meta
+Assets/ExternalDependencyManager/Editor/GoogleRegistries.xml
+Assets/ExternalDependencyManager/Editor/GoogleRegistries.xml.meta
 Assets/ExternalDependencyManager/Editor/LICENSE
 Assets/ExternalDependencyManager/Editor/LICENSE.meta
 Assets/ExternalDependencyManager/Editor/README.md

source/ImportUnityPackage/test_data/external-dependency-manager-1.2.153.unitypackage.contents.txt

@@ -20,6 +20,8 @@ Assets/ExternalDependencyManager/Editor/Google.VersionHandlerImpl_v1.2.153.dll
 Assets/ExternalDependencyManager/Editor/Google.VersionHandlerImpl_v1.2.153.dll.mdb
 Assets/ExternalDependencyManager/Editor/Google.VersionHandlerImpl_v1.2.153.dll.mdb.meta
 Assets/ExternalDependencyManager/Editor/Google.VersionHandlerImpl_v1.2.153.dll.meta
+Assets/ExternalDependencyManager/Editor/GoogleRegistries.xml
+Assets/ExternalDependencyManager/Editor/GoogleRegistries.xml.meta
 Assets/ExternalDependencyManager/Editor/LICENSE
 Assets/ExternalDependencyManager/Editor/LICENSE.meta
 Assets/ExternalDependencyManager/Editor/README.md