tests: enable system tests

Author: parthea

packages/google-cloud-logging/tests/system/gapic/v2/test_system_logging_service_v2_v2.py

@@ -24,8 +24,10 @@
 
 class TestSystemLoggingServiceV2(object):
     def test_write_log_entries(self):
-        # Use the monorepo standard environment variable
-        project_id = os.environ.get("GOOGLE_CLOUD_PROJECT")
+        # Use GOOGLE_CLOUD_PROJECT or PROJECT_ID
+        project_id = os.environ.get("GOOGLE_CLOUD_PROJECT") or os.environ.get(
+            "PROJECT_ID"
+        )
 
         # Guard: Skip if project or credentials are missing
         # This prevents the "prerelease_deps" job from failing

packages/google-cloud-logging/tests/system/test_system.py

@@ -105,8 +105,8 @@ class Config(object):
 
 
 def setUpModule():
-    # Use GOOGLE_CLOUD_PROJECT
-    project_id = os.environ.get("GOOGLE_CLOUD_PROJECT")
+    # Use GOOGLE_CLOUD_PROJECT or PROJECT_ID
+    project_id = os.environ.get("GOOGLE_CLOUD_PROJECT") or os.environ.get("PROJECT_ID")
 
     # Check if we have credentials (either via file or environment)
     # google.auth.default() will check GOOGLE_APPLICATION_CREDENTIALS