Apache Airflow version: 1.10.*
BackPort Packages version: 2020.10.29rc1

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/PolideaInternal/airflow/blob/e5307990adb49a5a1c1c88a029940682efee0f9e/airflow/providers/google/cloud/operators/bigquery.py#L2073

However, it would appear that the regex pattern that is attempting to remove the `+` character is not correct as this still remain in `job_id` after `re.sub` is applied.

https://github.com/PolideaInternal/airflow/blob/e5307990adb49a5a1c1c88a029940682efee0f9e/airflow/providers/google/cloud/operators/bigquery.py#L2073

`Invalid job ID "airflow_my_test_dag_v1_test_2020_10_01T00_00_00+00_00_27f69de5cd17a012f3c89d414a70fe64". Job IDs must be alphanumeric (plus underscores and dashes) and must be at most 1024 characters long.
`  

How to reproduce it:

- Create a DAG with the name my-test-dag-v1.
- Run any query against BigQuery using this operator
airflow/providers/google/cloud/operators/bigquery.py
bq_hook = BigQueryHook(
            gcp_conn_id=self.gcp_conn_id,
            delegate_to=self.delegate_to,
            impersonation_chain=self.impersonation_chain,
        )
        fields = self.fields or list(self.dataset_resource.keys())
        dataset = bq_hook.update_dataset(
            dataset_resource=self.dataset_resource,
            project_id=self.project_id,
            dataset_id=self.dataset_id,
            fields=fields,
        )
        return dataset.to_api_repr()
class BigQueryDeleteTableOperator(BaseOperator):
    """
    Deletes BigQuery tables
    .. seealso::
        For more information on how to use this operator, take a look at the guide:
        :ref:`howto/operator:BigQueryDeleteTableOperator`
    :param deletion_dataset_table: A dotted
        ``(<project>.|<project>:)<dataset>.<table>`` that indicates which table
        will be deleted. (templated)
    :type deletion_dataset_table: str
    :param gcp_conn_id: (Optional) The connection ID used to connect to Google Cloud.