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
BigQueryGetDataOperator,
    BigQueryGetDatasetOperator,
    BigQueryGetDatasetTablesOperator,
    BigQueryInsertJobOperator,
    BigQueryIntervalCheckOperator,
    BigQueryPatchDatasetOperator,
    BigQueryUpdateDatasetOperator,
    BigQueryUpsertTableOperator,
    BigQueryValueCheckOperator,
)
from airflow.serialization.serialized_objects import SerializedDAG
from airflow.settings import Session
from airflow.utils.session import provide_session
TASK_ID = 'test-bq-generic-operator'
TEST_DATASET = 'test-dataset'
TEST_DATASET_LOCATION = 'EU'
TEST_GCP_PROJECT_ID = 'test-project'
TEST_DELETE_CONTENTS = True
TEST_TABLE_ID = 'test-table-id'
TEST_GCS_BUCKET = 'test-bucket'
TEST_GCS_DATA = ['dir1/*.csv']
TEST_SOURCE_FORMAT = 'CSV'
DEFAULT_DATE = datetime(2015, 1, 1)
TEST_DAG_ID = 'test-bigquery-operators'
TEST_TABLE_RESOURCES = {"tableReference": {"tableId": TEST_TABLE_ID}, "expirationTime": 1234567}
VIEW_DEFINITION = {
    "query": "SELECT * FROM `{}.{}`".format(TEST_DATASET, TEST_TABLE_ID),
    "useLegacySql": False,
}
class TestBigQueryCreateEmptyTableOperator(unittest.TestCase):