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
job_id = self._job_id(context)
        try:
            job = self._submit_job(hook, job_id)
            self._handle_job_error(job)
        except Conflict:
            
            job = hook.get_job(
                project_id=self.project_id,
                location=self.location,
                job_id=job_id,
            )
            if job.state in self.reattach_states:
                
                job.result()
                self._handle_job_error(job)
            else:
                
                raise AirflowException(
                    f"Job with id: {job_id} already exists and is in {job.state} state. If you "
                    f"want to force rerun it consider setting `force_rerun=True`."
                    f"Or, if you want to reattach in this scenario add {job.state} to `reattach_states`"
                )
        self.job_id = job.job_id
        return job.job_id
    def on_kill(self) -> None:
        if self.job_id and self.cancel_on_kill:
            self.hook.cancel_job(  
                job_id=self.job_id, project_id=self.project_id, location=self.location
            )