**Apache Airflow version**: 1.10.*
**BackPort Packages version**: 2020.10.5rc1

**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/apache/airflow/blob/master/airflow/providers/google/cloud/operators/bigquery.py#L2072

However, because BigQuery only accepts alphanumeric (in additon to dashes and underscore) characters then, if a DagID contains a version number whcih includes a `.` character then this will cause the task to fail.

https://cloud.google.com/bigquery/docs/running-jobs#generate-jobid

**How to reproduce it**:
Create a DAG with the name `my-dag-v1.0`.
airflow/providers/google/cloud/operators/bigquery.py
schema_fields = self.schema_fields
        if schema_fields and self.table_resource:
            self.table_resource["externalDataConfiguration"]["schema"] = schema_fields
        if self.table_resource:
            tab_ref = TableReference.from_string(self.destination_project_dataset_table)
            bq_hook.create_empty_table(
                table_resource=self.table_resource,
                project_id=tab_ref.project,
                table_id=tab_ref.table_id,
                dataset_id=tab_ref.dataset_id,
            )
        else:
            source_uris = [f"gs://{self.bucket}/{source_object}" for source_object in self.source_objects]
            bq_hook.create_external_table(
                external_project_dataset_table=self.destination_project_dataset_table,
                schema_fields=schema_fields,
                source_uris=source_uris,
                source_format=self.source_format,
                compression=self.compression,
                skip_leading_rows=self.skip_leading_rows,
                field_delimiter=self.field_delimiter,
                max_bad_records=self.max_bad_records,
                quote_character=self.quote_character,
                allow_quoted_newlines=self.allow_quoted_newlines,
                allow_jagged_rows=self.allow_jagged_rows,
                src_fmt_configs=self.src_fmt_configs,
                labels=self.labels,
                encryption_configuration=self.encryption_configuration,
            )
class BigQueryDeleteDatasetOperator(BaseOperator):