Fix missing logical_date in DagRun for DMS operator tests

[sunank200]

This pull request resolves a Pydantic validation error in the DmsDescribeReplicationConfigsOperator tests caused by a missing logical_date field in the DagRun instance. The test was updated to set logical_date using execution_date, ensuring successful validation and correct construction of the template context.

Previously it was throwing following error:

providers/tests/amazon/aws/operators/test_dms.py:503: in test_template_fields_native
    context = ti.get_template_context(session)
airflow/models/taskinstance.py:3242: in get_template_context
    return _get_template_context(
airflow/models/taskinstance.py:960: in _get_template_context
    dag_run=DagRunSDK.model_validate(dag_run, from_attributes=True),
E   pydantic_core._pydantic_core.ValidationError: 1 validation error for DagRun
E   logical_date
E     Input should be a valid datetime [type=datetime_type, input_value=None, input_type=NoneType]
E       For further information visit https://errors.pydantic.dev/2.10/v/datetime_type

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[ashb]

We "shouldn't" need to change tests like this, but since we have #46522 lets merge this and unblock main.