fix(tracing): add getattr checks for safety in google-adk integration (#14724)

## Description

Fixes bug where `model` attribute isn't available. Adds getattr to be
safer and not cause errors.

## Testing

<!-- Describe your testing strategy or note what tests are included -->

## Risks

<!-- Note any risks associated with this change, or "None" if no risks
-->

## Additional Notes

<!-- Any other information that would be helpful for reviewers -->

---------

Co-authored-by: Sam Brenner <106700075+sabrenner@users.noreply.github.com>

Author: wconti27

ddtrace/contrib/internal/google_adk/patch.py

@@ -34,7 +34,9 @@ def get_version() -> str:
 def _traced_agent_run_async(adk, pin, wrapped, instance, args, kwargs):
     """Trace the main execution of an agent (async generator)."""
     integration: GoogleAdkIntegration = adk._datadog_integration
-    provider_name, model_name = extract_provider_and_model_name(instance=instance.agent.model, model_name_attr="model")
+    agent = getattr(instance, "agent", None)
+    model = getattr(agent, "model", None)
+    provider_name, model_name = extract_provider_and_model_name(instance=model, model_name_attr="model")
 
     span = integration.trace(
         pin,
@@ -79,7 +81,9 @@ async def _traced_functions_call_tool_async(adk, pin, wrapped, instance, args, k
         logger.warning("Unable to trace google adk live tool call, could not extract agent from tool context.")
         return wrapped(*args, **kwargs)
 
-    provider_name, model_name = extract_provider_and_model_name(instance=agent.model, model_name_attr="model")
+    provider_name, model_name = extract_provider_and_model_name(
+        instance=getattr(agent, "model", {}), model_name_attr="model"
+    )
     instance = instance or args[0]
 
     with integration.trace(
@@ -117,7 +121,9 @@ async def _traced_functions_call_tool_live(adk, pin, wrapped, instance, args, kw
         async for item in agen:
             yield item
 
-    provider_name, model_name = extract_provider_and_model_name(instance=agent.model, model_name_attr="model")
+    provider_name, model_name = extract_provider_and_model_name(
+        instance=getattr(agent, "model", {}), model_name_attr="model"
+    )
 
     with integration.trace(
         pin,

releasenotes/notes/fix-attribute-error-bug-google-adk-8970290a34e21692.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    google-adk: Fixes an ``AttributeError`` that could occur when tracing Google ADK agent runs, due to the agent ``model`` attribute not being defined for 
+    ``SequentialAgent`` class.