Deprecate passing $root to \Drupal\Core\Database\Connection::createConnectionOptionsFromUr

Problem/Motivation

Follow up of #3056698: Sqlite Connection::createConnectionOptionsFromUrl should not convert relative paths to full → .

Deprecate passing $root to \Drupal\Core\Database\Connection::createConnectionOptionsFromUrl - it is not used any implementations.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet