Move to builtin ember types

[elpoelma]

Overview

This PR includes improved types for:

• ember.js (use built-in types), more info at https://blog.emberjs.com/stable-typescript-types-in-ember-5-1/
• ember-data/warpdrive (use experimental, but more correct types), more info at https://github.com/emberjs/data/blob/main/guides/typescript/index.md

This change should provides us with:

• Improved auto-imports
• Some type information/hinting
• A path to gradually move to TS

connected issues and PRs:

None

How to test/reproduce

N/A

Challenges/uncertainties

While the ember-data types are still experimental, they are a lot better/correct than the DefinitelyTyped packages.

Checks PR readiness

• UI: works on smaller screen sizes
• UI: feedback for any loading/error states
• Check cancel/go-back flows
• Check database state correct when deleting/updating (especially regarding relationships)
• changelog
• npm lint
• no new deprecations