Draft: Issue #3472140: Add uninstall validator for l10n_client_contributor module.

Andreas Henningsrequested to merge
issue/l10n_client-3472140:3472140-uninstall-validator into 3.x

This is a proof of concept, exploring the uninstall validator direction.

I am only creating this because I already had that code in my local..

Edited by Andreas Hennings

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