Add default group_id to init params (#399)

## Description

When attempting to override the `group_id` parameter of a DbtTaskGroup,
I get the following error:

```text
TypeError: __init__() got multiple values for argument 'group_id'
```

## Related Issue(s)
closes #398 

## Breaking Change?

There are no breaking changes with this PR

## Checklist

- [x] I have made corresponding changes to the documentation (if
required)
- [x] I have added tests that prove my fix is effective or that my
feature works

Co-authored-by: Julian LaNeve <[email protected]>

cosmos/airflow/task_group.py

@@ -16,10 +16,11 @@ class DbtTaskGroup(TaskGroup, DbtToAirflowConverter):  # type: ignore[misc] # ig
 
     def __init__(
         self,
+        group_id: str = "dbt_task_group",
         *args: Any,
         **kwargs: Any,
     ) -> None:
-        group_id = kwargs.get("group_id", kwargs.get("dbt_project_name", "dbt_task_group"))
-        TaskGroup.__init__(self, group_id, *args, **airflow_kwargs(**kwargs))
+        group_id = group_id
+        TaskGroup.__init__(self, group_id=group_id, *args, **airflow_kwargs(**kwargs))
         kwargs["task_group"] = self
         DbtToAirflowConverter.__init__(self, *args, **specific_kwargs(**kwargs))

dev/dags/basic_cosmos_task_group.py

@@ -36,6 +36,7 @@ def basic_cosmos_task_group() -> None:
     pre_dbt = EmptyOperator(task_id="pre_dbt")
 
     jaffle_shop = DbtTaskGroup(
+        group_id="test_123",
         project_config=ProjectConfig(
             DBT_ROOT_PATH / "jaffle_shop",
         ),