fix: Make project_number to project_id mapping fail-open.

Fixes regression when deploying with IdentityType.AGENT_IDENTIY

FUTURE_COPYBARA_INTEGRATE_REVIEW=#6207 from googleapis:release-please--branches--main 95b8d4f
PiperOrigin-RevId: 846233944

Author: vertex-sdk-bot

vertexai/agent_engines/templates/adk.py

@@ -1654,8 +1654,15 @@ def _warn_if_telemetry_api_disabled(self):
 
     def project_id(self) -> Optional[str]:
         if project := self._tmpl_attrs.get("project"):
-            from google.cloud.aiplatform.utils import resource_manager_utils
+            try:
+                from google.cloud.aiplatform.utils import (
+                    resource_manager_utils,
+                )
+                from google.api_core import exceptions
 
-            return resource_manager_utils.get_project_id(project)
+                return resource_manager_utils.get_project_id(project)
+            # Fail open as temporary workaround for identity_type config parameter
+            except (exceptions.PermissionDenied, exceptions.Unauthenticated):
+                return project
 
         return None

vertexai/preview/reasoning_engines/templates/adk.py

@@ -1561,8 +1561,15 @@ def _warn_if_telemetry_api_disabled(self):
 
     def project_id(self) -> Optional[str]:
         if project := self._tmpl_attrs.get("project"):
-            from google.cloud.aiplatform.utils import resource_manager_utils
+            try:
+                from google.cloud.aiplatform.utils import (
+                    resource_manager_utils,
+                )
+                from google.api_core import exceptions
 
-            return resource_manager_utils.get_project_id(project)
+                return resource_manager_utils.get_project_id(project)
+            # Fail open as temporary workaround for identity_type config parameter
+            except (exceptions.PermissionDenied, exceptions.Unauthenticated):
+                return project
 
         return None