fix(agents-api): Executing agent-level integration tools in `tool_cal…

…l` step (#778)

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> [!IMPORTANT]
> Adjusts `ToolCallStep` in `TaskExecutionWorkflow` to handle different
integration spec formats with conditional logic for `TaskToolDef`.
> 
>   - **Behavior**:
> - Adjusts `ToolCallStep` handling in `TaskExecutionWorkflow` to
support different integration spec formats.
> - Introduces conditional logic to differentiate `TaskToolDef` from
other specs, adjusting `provider`, `setup`, and `method` extraction.
>   - **Misc**:
>     - Adds `TaskToolDef` import in `__init__.py`.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
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for ed1f234. It will automatically
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agents-api/agents_api/workflows/task_execution/__init__.py

@@ -34,6 +34,7 @@
         SleepFor,
         SleepStep,
         SwitchStep,
+        TaskToolDef,
         ToolCallStep,
         TransitionTarget,
         WaitForInputStep,
@@ -462,10 +463,21 @@ async def run(
                 if integration_spec is None:
                     raise ApplicationError(f"Integration {tool_name} not found")
 
+                # FIXME: Refactor this
+                # Tools that are not defined in the task spec have a different format
+                if isinstance(integration_spec, TaskToolDef):
+                    provider = integration_spec.spec["provider"]
+                    setup = integration_spec.spec["setup"]
+                    method = integration_spec.spec["method"]
+                else:
+                    provider = integration_spec.integration.provider
+                    setup = integration_spec.integration.setup.model_dump()
+                    method = integration_spec.integration.method
+
                 integration = BaseIntegrationDef(
-                    provider=integration_spec.spec["provider"],
-                    setup=integration_spec.spec["setup"],
-                    method=integration_spec.spec["method"],
+                    provider=provider,
+                    setup=setup,
+                    method=method,
                     arguments=arguments,
                 )