treewide: directly pass cargoRoot to fetcher

[TomaSajt]

Followup to #350541

You can run the following to test that it actually still can re-generate the FODs.

nix build .#{ccextractor,ibus-engines.openbangla-keyboard,kdePackages.akonadi-search,kdePackages.kdepim-addons,librepcb,opengamepadui,python313Packages.bcrypt,python313Packages.biliass,python313Packages.libcst,python313Packages.temporalio,ruby,surrealist,wealthfolio}.cargoDeps.vendorStaging --rebuild

(I have left out ceph's inner derivations from this command because they are not exposed directly)

Note: I have split this PR into separate commits in case some parts need backporting.

Question: should the docs follow the formatting rules, or can it stay in a format that's more readable (single-line)?
Edit: was answered in comments

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[TomaSajt]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review

---

x86_64-linux

⏩ 1 package blacklisted:

• nixos-install-tools

❌ 1 package failed to build:

• surrealist

✅ 72 packages built:

• alacarte
• ayatana-indicator-display
• blueberry
• btrfs-assistant
• ccextractor
• cinnamon-common
• cinnamon-gsettings-overrides
• cinnamon-screensaver
• cinnamon-session
• cross-seed
• fcitx5-openbangla-keyboard
• hypnotix
• ibus-engines.openbangla-keyboard
• kubecolor
• lightdm-slick-greeter
• lomiri.lomiri
• lomiri.lomiri-history-service
• lomiri.lomiri-history-service.dev
• lomiri.lomiri-session
• lomiri.telephony-service
• mate.marco
• mate.mate-applets
• mate.mate-control-center
• mate.mate-gsettings-overrides
• mate.mate-indicator-applet
• mate.mate-media
• mate.mate-netbook
• mate.mate-notification-daemon
• mate.mate-panel
• mate.mate-panel-with-applets
• mate.mate-power-manager
• mate.mate-screensaver
• mate.mate-sensors-applet
• mate.mate-session-manager
• mate.mate-settings-daemon-wrapped
• mate.mate-tweak
• mate.mate-tweak.dist
• mate.mate-utils
• mate.mate-wayland-session
• nemo
• nemo-fileroller
• nemo-python
• nemo-with-extensions
• nemo.dev
• nixpkgs-manual
• pix
• plata-theme
• python312Packages.mmcv
• python312Packages.mmcv.dist
• python312Packages.mmengine
• python312Packages.mmengine.dist
• python312Packages.python-xapp
• python313Packages.python-xapp
• snapper
• snapper-gui
• snapper-gui.dist
• sticky
• telepathy-mission-control
• telepathy-mission-control.dev
• telepathy-mission-control.lib
• timeshift
• timeshift-minimal
• timeshift-unwrapped
• warpinator
• xapp
• xapp.dev
• xdg-desktop-portal-xapp
• xed-editor
• xilinx-bootgen
• xmonad_log_applet_mate
• xreader
• xviewer

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surrealist build failure is unrelated

[MDM23]

Nice, thanks for fixing this! The surrealist build should be fixed by #373428.

[K900]

ack