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
tests/providers/google/cloud/operators/test_bigquery.py
@parameterized.expand(
        [
            (BigQueryCheckOperator, dict(sql='Select * from test_table', task_id=TASK_ID)),
            (
                BigQueryValueCheckOperator,
                dict(sql='Select * from test_table', pass_value=95, task_id=TASK_ID),
            ),
            (
                BigQueryIntervalCheckOperator,
                dict(table=TEST_TABLE_ID, metrics_thresholds={'COUNT(*)': 1.5}, task_id=TASK_ID),
            ),
            (BigQueryGetDataOperator, dict(dataset_id=TEST_DATASET, table_id=TEST_TABLE_ID, task_id=TASK_ID)),
            (BigQueryExecuteQueryOperator, dict(sql='Select * from test_table', task_id=TASK_ID)),
            (BigQueryDeleteDatasetOperator, dict(dataset_id=TEST_DATASET, task_id=TASK_ID)),
            (BigQueryCreateEmptyDatasetOperator, dict(dataset_id=TEST_DATASET, task_id=TASK_ID)),
            (BigQueryDeleteTableOperator, dict(deletion_dataset_table=TEST_DATASET, task_id=TASK_ID)),
        ]
    )
    def test_bigquery_conn_id_deprecation_warning(self, operator_class, kwargs):
        bigquery_conn_id = 'google_cloud_default'
        with self.assertWarnsRegex(
            DeprecationWarning,
            "The bigquery_conn_id parameter has been deprecated. You should pass the gcp_conn_id parameter.",
        ):
            operator = operator_class(bigquery_conn_id=bigquery_conn_id, **kwargs)
            self.assertEqual(bigquery_conn_id, operator.gcp_conn_id)
class TestBigQueryUpsertTableOperator(unittest.TestCase):