Migrate to mariadb database driver

As per the update guide [1], this should be comparable to the `mysql` driver. Keep the options the same as the in the database docs [2].

The connection name remains `mysql` because we found this is used in an unknown number of places. We saw most of the tests fail when renaming this to `mariadb` but we don't want to investigate this now. We also thought that we should name this something like technology agnostic and with clear purpose such as `platform_api_db`.

[1]: https://laravel.com/docs/11.x/upgrade#dedicated-mariadb-driver
[2]: https://laravel.com/docs/11.x/database#read-and-write-connections

Bug: T426075

Author: outdooracorn

config/database.php

@@ -55,7 +55,7 @@
             // against the database during the current request cycle,
             // any further "read" operations will use the "write" connection.
             'sticky' => true,
-            'driver' => 'mysql',
+            'driver' => 'mariadb',
             'url' => env('DATABASE_URL'),
             'port' => env('DB_PORT', '3306'),
             'database' => env('DB_DATABASE'),
@@ -89,7 +89,7 @@
             // against the database during the current request cycle,
             // any further "read" operations will use the "write" connection.
             'sticky' => true,
-            'driver' => 'mysql',
+            'driver' => 'mariadb',
             'url' => env('MW_DATABASE_URL'),
             'port' => env('MW_DB_PORT', '3306'),
             'database' => env('MW_DB_DATABASE'),