refactor(editor): Migrate settings.store to composition API (no-changelog)

[RicardoE105]

Summary

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• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[RicardoE105]

@elsmr, any pointers on why the last test for AssignmentCollection is failing? I know the drop event handler is never called, even though it should be, but I could not figure out why it's not triggered. I wasted already a couple of hours trying to figure it out 😞 .