Auto-diagnose on db:* commands to prevent wrong database usage in v3.19

[llaville]

The new version 3.19 will include an auto-diagnose procedure to help new users on a basic learn practice.

After installation of Application source code with git clone or composer install, you have to create a database and initialize its contents.

If you missed some steps (see getting started part of the documentation), the diagnose command help you to see what is wrong in your current context.
With 3.19 you'll see also a new section that display environment variables of application. Something like that.

But if you forget to have a look on it, an auto-diagnose will be launch on all db:* commands (except for db:create), and in case of error will display the following message.