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
@mock.patch('airflow.providers.google.cloud.operators.bigquery.BigQueryHook')
    def test_execute(self, mock_hook):
        operator = BigQueryCreateExternalTableOperator(
            task_id=TASK_ID,
            destination_project_dataset_table='{}.{}'.format(TEST_DATASET, TEST_TABLE_ID),
            schema_fields=[],
            bucket=TEST_GCS_BUCKET,
            source_objects=TEST_GCS_DATA,
            source_format=TEST_SOURCE_FORMAT,
        )
        operator.execute(None)
        mock_hook.return_value.create_external_table.assert_called_once_with(
            external_project_dataset_table='{}.{}'.format(TEST_DATASET, TEST_TABLE_ID),
            schema_fields=[],
            source_uris=[
                'gs://{}/{}'.format(TEST_GCS_BUCKET, source_object) for source_object in TEST_GCS_DATA
            ],
            source_format=TEST_SOURCE_FORMAT,
            compression='NONE',
            skip_leading_rows=0,
            field_delimiter=',',
            max_bad_records=0,
            quote_character=None,
            allow_quoted_newlines=False,
            allow_jagged_rows=False,
            src_fmt_configs={},
            labels=None,
            encryption_configuration=None,
        )
class TestBigQueryDeleteDatasetOperator(unittest.TestCase):