**Apache Airflow version**: 1.10.*
**BackPort Packages version**: 2020.10.5rc1

**What happened**:

`BigQueryInsertJobOperator` tries to start a BigQuery job by specifying a job_id which is a combination of `dag_id`, `task_id`, `execution_date` and an additional `uniqueness_suffix`.

https://github.com/apache/airflow/blob/master/airflow/providers/google/cloud/operators/bigquery.py#L2072

However, because BigQuery only accepts alphanumeric (in additon to dashes and underscore) characters then, if a DagID contains a version number whcih includes a `.` character then this will cause the task to fail.

https://cloud.google.com/bigquery/docs/running-jobs#generate-jobid

**How to reproduce it**:
Create a DAG with the name `my-dag-v1.0`.
airflow/providers/google/cloud/operators/bigquery.py
bq_hook = BigQueryHook(
            gcp_conn_id=self.gcp_conn_id,
            delegate_to=self.delegate_to,
            location=self.location,
            impersonation_chain=self.impersonation_chain,
        )
        try:
            bq_hook.create_empty_dataset(
                project_id=self.project_id,
                dataset_id=self.dataset_id,
                dataset_reference=self.dataset_reference,
                location=self.location,
                exists_ok=False,
            )
        except Conflict:
            dataset_id = self.dataset_reference.get("datasetReference", {}).get("datasetId", self.dataset_id)
            self.log.info('Dataset %s already exists.', dataset_id)
class BigQueryGetDatasetOperator(BaseOperator):
    """
    This operator is used to return the dataset specified by dataset_id.
    .. seealso::
        For more information on how to use this operator, take a look at the guide:
        :ref:`howto/operator:BigQueryGetDatasetOperator`
    :param dataset_id: The id of dataset. Don't need to provide,
        if datasetId in dataset_reference.