DEV: Remove `suspend` from Admin::UsersController responses (PR #8206)

suspend isn’t a User attribute, but was being assigned to the frontend User model as if it was. The model has a computed property that depends on suspended_till, so instead of overriding this property, it’s better to return relevant attributes.

Fixes a computed-property.override deprecation (https://emberjs.com/deprecations/v3.x#toc_computed-property-override)

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