Typo in Google Cloud Storage sensor: airflow/providers/google/cloud/sensors/gcs/GCSObjectsWithPrefixExistenceSensor

The word _With_ is spelled incorrectly. It should be: GCSObjects**With**PrefixExistenceSensor

**Apache Airflow version**: 2.0.0
**Environment**:
- **Cloud provider or hardware configuration**: Google Cloud
- **OS** (e.g. from /etc/os-release): Mac OS BigSur






tests/always/test_project_structure.py
'airflow.providers.google.cloud.operators.dlp.CloudDLPGetDLPJobOperator',
        'airflow.providers.google.cloud.operators.dlp.CloudDLPGetInspectTemplateOperator',
        'airflow.providers.google.cloud.operators.dlp.CloudDLPListInfoTypesOperator',
        'airflow.providers.google.cloud.operators.dlp.CloudDLPDeleteDeidentifyTemplateOperator',
        'airflow.providers.google.cloud.operators.dlp.CloudDLPListDLPJobsOperator',
        'airflow.providers.google.cloud.operators.dlp.CloudDLPRedactImageOperator',
        'airflow.providers.google.cloud.operators.datastore.CloudDatastoreDeleteOperationOperator',
        'airflow.providers.google.cloud.operators.datastore.CloudDatastoreGetOperationOperator',
        
        'airflow.providers.google.cloud.operators.compute.ComputeEngineBaseOperator',
        'airflow.providers.google.cloud.sensors.gcs.GCSObjectExistenceSensor',
        'airflow.providers.google.cloud.sensors.gcs.GCSObjectUpdateSensor',
        'airflow.providers.google.cloud.sensors.gcs.GCSObjectsWtihPrefixExistenceSensor',
        'airflow.providers.google.cloud.sensors.gcs.GCSUploadSessionCompleteSensor',
    }
    def test_example_dags(self):
        operators_modules = itertools.chain(
            *[self.find_resource_files(resource_type=d) for d in ["operators", "sensors", "transfers"]]
        )
        example_dags_files = self.find_resource_files(resource_type="example_dags")
        
        operator_sets = [(f.split("/")[-3], f.split("/")[-1].rsplit(".")[0]) for f in operators_modules]
        example_sets = [
            (f.split("/")[-3], f.split("/")[-1].rsplit(".")[0].replace("example_", "", 1))
            for f in example_dags_files
        ]
        def has_example_dag(operator_set):
            for e in example_sets:
                if e[0] != operator_set[0]:
                    continue