Logging: allow disabling logging for all connections

[glaubinix]

Having one or multiple connections set up and all of them logging: false configured, activates logging via Middleware for all connection.

Sample configuration:

doctrine:
    dbal:
        connections:
            default:
                driver: 'pdo_pgsql'
                url: '%env(DATABASE_URL)%'
                logging: false

The middlewares.xml defines a doctrine.middleware tag by default for Doctrine\DBAL\Logging\Middleware, which the MiddlewaresPass then applies to all connections. Having one or more connections with logging: true will overwrite the tag and set connections to an array of connections, which then only enables logging for those configured connections. That second part is working as expected.

[dmaicher]

@l-vo can you have a look at this too?

[l-vo]

LGTM too, thank you :)

[dmaicher]

Thank you @glaubinix