feat(host): add git-lfs to cc-ci-hetzner systemPackages

Required by test_lfs_roundtrip.py for the M2 LFS capstone run on the
lfs-plain-gitea PR branch. Also revert the same change from the Incus
host (cc-ci/configuration.nix) where it was mistakenly added.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

nix/hosts/cc-ci-hetzner/configuration.nix

@@ -66,6 +66,7 @@
   environment.systemPackages = with pkgs; [
     curl
     git
+    git-lfs
     jq
     openssh
   ];

nix/hosts/cc-ci/configuration.nix

@@ -56,7 +56,6 @@
   environment.systemPackages = with pkgs; [
     curl
     git
-    git-lfs
     jq
     openssh
   ];