Refactor Drupal\Core\Database\Database::convertDbUrlToConnectionInfo() as now all database drivers are provided by a module.

Problem/Motivation

In #3129043: Move core database drivers to modules of their own → we are moving the core database drivers to their own module. That is great, only in D9 contrib database drivers can still live in the "drivers" directory. Those drivers are deprecated in D9 and will be removed before D10. Until D10 we shall have to support those drivers that are not provided by a module.

Proposed resolution

Remove the option in the method Drupal\Core\Database\Database::convertDbUrlToConnectionInfo() for when a database driver is not provided by a module.

Remaining tasks

TBD

User interface changes

None

API changes

None

Data model changes

None

Release notes snippet

None