MongoDB integration - connectionstring parameters

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

I'm trying to use a container image with the integration that has replicaset enabled. As it is a single node replicaset, I need to add a connectionString option of `directConnection=true`. As it is not possible to add additional connectionString options using the integration, it is now unable to complete the healthcheck and provide the desired connection string to the application.

There are many more connectionString options available: https://www.mongodb.com/docs/manual/reference/connection-string-options/

As a workaround I now use AddContainer instead.

### Describe the solution you'd like

Add a way to provide additional connectionString options to the integration

### Additional context

_No response_