Tegbessou

Ignore exit code option doesn't work

1

## Describe the bug Hello, I think the `--ignore-exit-code` doesn't work anymore because, in the `UnusedCommand`, I can't find a mention of it except for as an attribute. I hope...

Add documentation about migrate with horizontal migration

2

| Questions | Answers | ------------- | ------------------------------------------------------- | Branch? | 8.x | Description? | I add documentation about migrating a list with horizontal migration. | Fixed ticket? | Fixes...