**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
self,
        source_project_dataset_tables: Union[List, str],
        destination_project_dataset_table: str,
        write_disposition: str = 'WRITE_EMPTY',
        create_disposition: str = 'CREATE_IF_NEEDED',
        labels: Optional[Dict] = None,
        encryption_configuration: Optional[Dict] = None,
    ) -> str:
        """
        Executes a BigQuery copy command to copy data from one BigQuery table
        to another. See here:
        https://cloud.google.com/bigquery/docs/reference/v2/jobs#configuration.copy
        For more details about these parameters.
        :param source_project_dataset_tables: One or more dotted
            ``(project:|project.)<dataset>.<table>``
            BigQuery tables to use as the source data. Use a list if there are
            multiple source tables.
            If ``<project>`` is not included, project will be the project defined
            in the connection json.
        :type source_project_dataset_tables: list|string
        :param destination_project_dataset_table: The destination BigQuery
            table. Format is: ``(project:|project.)<dataset>.<table>``
        :type destination_project_dataset_table: str
        :param write_disposition: The write disposition if the table already exists.
        :type write_disposition: str
        :param create_disposition: The create disposition if the table doesn't exist.
        :type create_disposition: str
        :param labels: a dictionary containing labels for the job/query,
            passed to BigQuery