Allow selecting a schema in database connection string settings

Database connection strings accept a schema parameter that allows specifying the schema to use. In the database settings page, under connection string info, it's currently not poissible to select a schema and get the automatically generated string that includes the parameter if needed.

As a user, I want to be able to choose a specific database schema and get the correct connection string that includes the schema parameter if the selection differs from public.

Here's a screenshot of what I'm referring to.

![image](

Let me know if you have any questions.