Also prevent overriding config translation

Problem/Motivation

This module is useful to prevent overriding interface translation when importing config.
But it would also be useful to prevent overriding config when importing interface translation.
(Our use case is to keep config translation and interface translation completely separate.)

Steps to reproduce

1. Add a string to interface translation that also exists in configuration.
2. Configuration is overriden when importing translation.

(There is an explanation here about why Drupal does this.)

Proposed resolution

We could override the locale.config_manager service to prevent this.

But maybe having a separate contrib module for this would make more sense?