Fix Immer current usage when calling addManyMutably more than once

[JacobShafer]

A getCurrent() util was created that checks if the value is draftable before calling current(value). Asequence of addOne() + addOne() hits the case where now state.ids is a plain array, and thus current(state.ids) will throw because it's a plain value and not a draft.

Resolves: #4411

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[EskiMojo14]

thanks!