**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/hooks/bigquery.py
"""
        Delete an existing table from the dataset;
        If the table does not exist, return an error unless ignore_if_missing
        is set to True.
        :param deletion_dataset_table: A dotted
            ``(<project>.|<project>:)<dataset>.<table>`` that indicates which table
            will be deleted.
        :type deletion_dataset_table: str
        :param ignore_if_missing: if True, then return success even if the
            requested table does not exist.
        :type ignore_if_missing: bool
        :return:
        """
        warnings.warn("This method is deprecated. Please use `delete_table`.", DeprecationWarning)
        return self.delete_table(table_id=deletion_dataset_table, not_found_ok=ignore_if_missing)
    @GoogleBaseHook.fallback_to_default_project_id
    def delete_table(