**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
"""The schema description method is not currently implemented"""
        raise NotImplementedError
    def close(self) -> None:
        """By default, do nothing"""
    @property
    def rowcount(self) -> int:
        """By default, return -1 to indicate that this is not supported"""
        return -1
    def execute(self, operation: str, parameters: Optional[Dict] = None) -> None:
        """
        Executes a BigQuery query, and returns the job ID.
        :param operation: The query to execute.
        :type operation: str
        :param parameters: Parameters to substitute into the query.
        :type parameters: dict
        """
        sql = _bind_parameters(operation, parameters) if parameters else operation
        self.flush_results()
        self.job_id = self.hook.run_query(sql)
    def executemany(self, operation: str, seq_of_parameters: List) -> None: