python3Packages: Fix and document the removal of the local `.overrideAttrs` attribute (#350127)

- The NVIDIA driver no longer defaults to the proprietary kernel module with versions >= 560. You will need to manually set `hardware.nvidia.open` to select the proprietary or open modules.

- The `(buildPythonPackage { ... }).override` attribute is now deprecated and removed in favour of `overridePythonAttrs`.

- The `(buildPythonPackage { ... }).override` and `(buildPythonPackage { ... }).overrideDerivation` attributes is now deprecated and removed in favour of `overridePythonAttrs` and `lib.overrideDerivation`.

  This change does not affect the override interface of most Python packages, as [`<pkg>.override`](https://nixos.org/manual/nixpkgs/unstable/#sec-pkg-override) provided by `callPackage` shadows such a locally-defined `override` attribute.

  The `<pkg>.overrideDerivation` attribute of Python packages called with `callPackage` will also remain available after this change.

- All Cinnamon and XApp packages have been moved to top-level (i.e., `cinnamon.nemo` is now `nemo`).

      };

      passthru.tests = import ./python-catch-conflicts-hook-tests.nix {

        inherit pythonOnBuildForHost runCommand;

        inherit lib;

        inherit (pkgs) coreutils gnugrep writeShellScript;

      };

    } ./python-catch-conflicts-hook.sh) {};

{ pythonOnBuildForHost, runCommand, writeShellScript, coreutils, gnugrep }: let

{ lib, pythonOnBuildForHost, runCommand, writeShellScript, coreutils, gnugrep }: let

  pythonPkgs = pythonOnBuildForHost.pkgs;

  );

  # in order to test for a failing build, wrap it in a shell script

  expectFailure = build: errorMsg: build.overrideDerivation (old: {

  expectFailure = build: errorMsg: lib.overrideDerivation build (old: {

    builder = writeShellScript "test-for-failure" ''

      export PATH=${coreutils}/bin:${gnugrep}/bin:$PATH

      ${old.builder} "$@" > ./log 2>&1

    ];

    passthru.tests = {

      all-tests = self.override { doCheck = true; };

      all-tests = self.overridePythonAttrs { doCheck = true; };

    };

    meta = {