Db removal if db exit with same name without error

When i created the new site same DB it will not prompt or show any issue it silently Drop the db and recreate it without any backing up in mariadb setup

commond is bench new-site frappev16.localhost --db-name "_d2ab67371ef19479"

Start at the `bench new-site` command and trace the MariaDB setup path used with `--db-name`. Reproduce the command with an existing database name, then verify that the command reports the conflict and does not silently drop or recreate the database.

Written by the indexing model from the issue text.