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gradle{,_7,_8,_9}{,-unwrapped}: remove callPackage from all-packages.nix
Since we now have a more strict nixpkgs-vet, deal with all the Gradle callPackage (including for unwrapped versions) in the package set, instead of continuing to fight against CI. See #421047 for context. Should retain complete compatibility with previous nixpkgs versions, particularly check that there were no messups in the review.