[11.x] Remove redundant implementation of ConnectorInterface in MariaDbConnector

[saMahmoudzadeh]

In this PR, implementation of the ConnectorInterface from the MariaDbConnector class has been removed.

Class MySqlConnector itself implements the ConnectorInterface. Therefore, any class that inherits from MySqlConnector also has this interface.

class MySqlConnector extends Connector implements ConnectorInterface
{
 // ...
}

class MariaDbConnector extends MySqlConnector
{
}

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