**Feature summary**:
Opposite of {T231705}
We want to be able to exclude running certain validation on certain messages
**Use case(s)**:
The newly added `NotEmptyValidator` should not apply on optional messages.
**Implementation details**:
This could be implemented in a manner similar to the existing `keymatch` functionality.
Example:
```
keymatch:
- 'untranslated' # Matches key untranslated directly
-
type: 'wildcard'
pattern: '*translated*' # Matches any key that has the translated in it
```
Other notes,
* Exclusion list will be specific for validator.
* Check `doesKeyMatch` method in `ValidationRunner.php` that can be reused for this.
* For now, exclusion list will not be configurable on language basis. So it is not possible to configure validators to not run //for a specific key for a specific language//.
* Migrate `validation-exclusion-list.php`. Create a task for this.