mkRenamedOptionModule/mkRemovedOptionModule are nixpkgs' own tested
machinery; proving each call site resolves is redundant with what the
library already guarantees. Removes 10 of the ~79 full nixosSystem
fixtures (wireguard/forge/matrix/controller/ui/stores/statusPublish/
peers old-path + matrixMovedAppserviceToken/matrixRemovedToken) and
their 15 dedicated cases. Fixtures still exercised by genuine
behavioral cases (natsOldPath, autheliaOldPath, grafanaOldPath) are
kept, minus their now-redundant rename-only case.
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