**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
:type impersonation_chain: Union[str, Sequence[str]]
    """
    template_fields = (
        'dataset_id',
        'table_id',
        'project_id',
        'gcs_schema_object',
        'labels',
        'view',
        'impersonation_chain',
    )
    ui_color = BigQueryUIColors.TABLE.value
    
    @apply_defaults
    def __init__(
        self,
        *,
        dataset_id: str,
        table_id: str,
        table_resource: Optional[Dict[str, Any]] = None,
        project_id: Optional[str] = None,
        schema_fields: Optional[List] = None,
        gcs_schema_object: Optional[str] = None,
        time_partitioning: Optional[Dict] = None,
        bigquery_conn_id: str = 'google_cloud_default',
        google_cloud_storage_conn_id: str = 'google_cloud_default',
        delegate_to: Optional[str] = None,
        labels: Optional[Dict] = None,
        view: Optional[Dict] = None,
        encryption_configuration: Optional[Dict] = None,