Move Key Configuration Overrides tab under Key menu.

Created MR requesting review. Refer screenshot below:

I hadn't seen this Key Configuration Overrides feature before, and when I read the form, it wasn't clear to me what a key configuration override actually was.

So I checked the docs → and found:

The Drupal 8 version of Key provides the ability to override any configuration value with a key. This allows site administrators to store configuration values in a more secure method than in the database or in settings.php.

So these are "Configuration overrides enabled by the Key module" rather than "Overrides of configuration for the Key module."

As a result, although I didn't know the feature existed before (there should be a better way of letting people know it exists?), I don't think just moving it to the Key module page makes sense because this is about configuration of Drupal as a whole, not configuration of individual keys. But the current title (Key Configuration Overrides) implies it is about "Key configuration", in other words, the configuration of keys, and the tab title ("Key overrides") suggests that even more strongly.