v8.0.0-rc.17-dev.30: TML-3468: Close the project Storage a model does not map (#30704)

发生了什么

At a glance This PR removes projects/unmapped-storage/ , the planning files of the project "Storage a model does not map". Its four slices have merged, and its decisions live in ADR 267 ( #30641 ). It also corrects one stale phrase in the Prisma 7 source project's slice 1 spec: an @ignore field used by an index is now kept, not refused. Merge this after ADR 267 ( #30641 ), because the project's done conditions inclu…

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