Skip analysis of non-solution files

Some exercises consist of more than one file in the `src/main/java` folder, and some of them are designed to be read-only files. These are marked as such in the exercise's `.meta/config.json` file, because they should be listed in the `files.editor` list.

For example, the [configuration for the `wizards-and-warriors-2` exercise](https://github.com/exercism/java/blob/main/exercises/concept/wizards-and-warriors-2/.meta/config.json) lists the following files as read-only:

- `src/main/java/Character.java`
- `src/main/java/Destination.java`
- `src/main/java/TravelMethod.java`

The goal of this issue is to make sure that read-only files are never processed by the analyzer.

In most cases processing these files may not introduce any issues, but just in case one of them contains code that triggers an analyzer comment we should skip them by default. If not, a student may receive feedback on a file that they did not write and cannot edit, which is just confusing.

Commencez par exercises/concept/wizards-and-warriors-2/.meta/config.json et suivez la façon dont l’analyseur lit sa liste files.editor. Le travail est terminé lorsque les fichiers qui y sont marqués en lecture seule sont exclus de l’analyse, tandis que les fichiers de solution modifiables continuent d’être traités.

Rédigé par le modèle d'indexation à partir du texte de l'issue.