**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/hooks/bigquery.py
}
        time_partitioning = _cleanse_time_partitioning(destination_project_dataset_table, time_partitioning)
        if time_partitioning:
            configuration['load'].update({'timePartitioning': time_partitioning})
        if cluster_fields:
            configuration['load'].update({'clustering': {'fields': cluster_fields}})
        if schema_fields:
            configuration['load']['schema'] = {'fields': schema_fields}
        if schema_update_options:
            if write_disposition not in ["WRITE_APPEND", "WRITE_TRUNCATE"]:
                raise ValueError(
                    "schema_update_options is only "
                    "allowed if write_disposition is "
                    "'WRITE_APPEND' or 'WRITE_TRUNCATE'."
                )
            else:
                self.log.info("Adding experimental 'schemaUpdateOptions': %s", schema_update_options)
                configuration['load']['schemaUpdateOptions'] = schema_update_options
        if max_bad_records:
            configuration['load']['maxBadRecords'] = max_bad_records
        if encryption_configuration:
            configuration["load"]["destinationEncryptionConfiguration"] = encryption_configuration
        src_fmt_to_configs_mapping = {
            'CSV': [
                'allowJaggedRows',
                'allowQuotedNewlines',
                'autodetect',
                'fieldDelimiter',
                'skipLeadingRows',
                'ignoreUnknownValues',