Return all repeated items of a SharedSlice, not just the first item

[nanorepublica]

Types of changes

• Chore (a non-breaking change which is related to package maintenance)
• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Current shared slices with repeated items will only return the first item. This causes GraphQL to error as it expects an Iterable but the data is returning an object.

Checklist:

• My change requires an update to the official documentation.
• All TSDoc comments are up-to-date and new ones have been added where necessary.
• All new and existing tests are passing.