Informs #56536

Use of external storage temp tokens, together with explicit authentication is dangerous.
In general, explicitly specified tokens could expire while long running operation (backup, restore)
is still executing, without any way for us to regenerate such temp token.

We should error out if external storage URI uses temporary credentials for backup, restore,
import, scheduled ba

Currently, the JDBC string containing the host name and port is hardcoded. For example, consider the connection string for MySQL:

https://github.com/sqlancer/sqlancer/blob/e62224edcb43fe421dc87601f75090739e34e595/src/sqlancer/mysql/MySQLProvider.java#L248

It would be desirable to make this configurable. We could provide an option to set the JDBC string for each DBMS. For example, for MySQL,