Handle AutoGKE in composer_db_transfer.py (#6438)
Handle AutoGKE in composer_db_transfer.py (#6438)

(+ clarify DRS-related messages)

Co-authored-by: Leah E. Cole <a5082685b0b89abc4f85079ca3a58177707489f8@users.noreply.github.com>
GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples