Layout overrides cannot be translated

Problem/Motivation

You cannot update the Layout of a translated entity when you allow layout overrides per entity.

To reproduce:

1. Add a new language and enable translation for the Basic page content type.
2. Enable Layout Builder and tick Allow each content item to have its layout customized.
3. Create a Basic page in its original language.
4. Translate the Basic page to the new language.
5. Update the Layout of the translated node and Save the layout.

Expected result:

The translated node should have its layout updated.

Current behaviour:

The original node layout has been updated.

Layout Builder loads the wrong entity.

Proposed resolution

There are a few things that need to be done:

• Update getSectionListFromId() to load the correct translation of an entity by using EntityRepository::getTranslationFromContext.
• Clone the inline blocks for the translated node, if the original node has an override.

Remaining tasks

• Get#3013197: Cloning an implementation of SectionListInterface does not deep clone the Section or SectionComponent objectscommitted.
• Write more tests for Inline blocks. <-- We are here.

User interface changes

API changes

Data model changes