Follow-up for #3591596: add PHPat rules for keeping `StagedLanguageConfigOverride` config entity type-agnostic
The following discussion from !1271 should be addressed:
- [ ] @penyaskito started a [discussion](https://git.drupalcode.org/project/canvas/-/merge_requests/1271#note_1268169): (+3 comments)
> Shouldn't this be restricted to our known `ComponentTreeConfigEntityBase` implementers?
issue