Add DB-API sqlcomment mysql_client_version fallback (#3729)

* Add dbapi comment mysql_client_version fallback

* Changelog

* Add docker test_mysql_sqlcommenter

* Update dbapi docker-tests

* Add test fetchall

* Add test case for cmysql unknown

* Change to patch

* Rm test attempt

* Changelog

* simplify commenter_data assn

* Add Pure Python mysql_client_version unknown test

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Co-authored-by: Emídio Neto <9735060+emdneto@users.noreply.github.com>