testing(run): use correct envvars (#4450)

there are some GCLOUD_PROJECT leftovers

Author: Takashi Matsuo

run/hello-broken/noxfile_config.py

@@ -30,7 +30,7 @@
     # to 'BUILD_SPECIFIC_GCLOUD_PROJECT' if you want to opt in using a
     # build specific Cloud project. You can also use your own string
     # to use your own Cloud project.
-    'gcloud_project_env': 'GCLOUD_PROJECT',
+    'gcloud_project_env': 'GOOGLE_CLOUD_PROJECT',
     # 'gcloud_project_env': 'BUILD_SPECIFIC_GCLOUD_PROJECT',
 
     # A dictionary you want to inject into your test. Don't put any

run/helloworld/noxfile_config.py

@@ -30,7 +30,7 @@
     # to 'BUILD_SPECIFIC_GCLOUD_PROJECT' if you want to opt in using a
     # build specific Cloud project. You can also use your own string
     # to use your own Cloud project.
-    'gcloud_project_env': 'GCLOUD_PROJECT',
+    'gcloud_project_env': 'GOOGLE_CLOUD_PROJECT',
     # 'gcloud_project_env': 'BUILD_SPECIFIC_GCLOUD_PROJECT',
 
     # A dictionary you want to inject into your test. Don't put any