When adding a new translation the entity should start from the draft state

Problem/Motivation

1. Configure a site with two languages
2. Enable content translation and content moderation for nodes
3. Create a node in language-1 with the "published" state
4. Translate to language-2
5. The current state will be shown as "published", which seems odd because the translation has not been added.

This was discovered in #2915398: The moderation_state field is not computed during the creation of a new entity translation..

Proposed resolution

Use hook_entity_translation_create() to reset the moderation state.

Remaining tasks

Fix tests

User interface changes

API changes

Data model changes