[Symfony] Persist doctrine.dbal.backend_connection if Doctrine2 module is used
[Symfony] Persist doctrine.dbal.backend_connection if Doctrine2 module is used

Fixes #3479

pitpit/Codeception,Naktibalda/Codeception,sergeyklay/Codeception,Codeception/base,tiger-seo/Codeception,Codeception/Codeception,kt81/Codeception,Vreasy/Codeception,Naktibalda/Codeception,sergeyklay/Codeception,tasselchof/Codeception,pitpit/Codeception,janhenkgerritsen/Codeception,hubbyist/Codeception,Naktibalda/Codeception,Codeception/base,Vreasy/Codeception,janhenkgerritsen/Codeception,tiger-seo/Codeception,Codeception/base,tasselchof/Codeception,kt81/Codeception,Codeception/Codeception,tasselchof/Codeception,hubbyist/Codeception