**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
task_id='BigQueryCreateEmptyTableOperator_task',
                dataset_id='ODS',
                table_id='Employees',
                project_id='internal-gcp-project',
                gcs_schema_object='gs://schema-bucket/employee_schema.json',
                bigquery_conn_id='airflow-conn-id',
                google_cloud_storage_conn_id='airflow-conn-id'
            )
        **Corresponding Schema file** (``employee_schema.json``): ::
            [
              {
                "mode": "NULLABLE",
                "name": "emp_name",
                "type": "STRING"
              },
              {
                "mode": "REQUIRED",
                "name": "salary",
                "type": "INTEGER"
              }
            ]
        **Example (with schema in the DAG)**: ::
            CreateTable = BigQueryCreateEmptyTableOperator(
                task_id='BigQueryCreateEmptyTableOperator_task',
                dataset_id='ODS',
                table_id='Employees',
                project_id='internal-gcp-project',
                schema_fields=[{"name": "emp_name", "type": "STRING", "mode": "REQUIRED"},
                               {"name": "salary", "type": "INTEGER", "mode": "NULLABLE"}],
                bigquery_conn_id='airflow-conn-id-account',