rename nix_shell_legacy to nix_shell and run_cmd to nix_shell

Than it's more obvious that we need to migrate.

pkgs/clan-cli/clan_cli/facts/generate.py

@@ -18,7 +18,7 @@ from clan_cli.errors import ClanError
 from clan_cli.git import commit_files
 from clan_cli.machines.inventory import get_all_machines, get_selected_machines
 from clan_cli.machines.machines import Machine
-from clan_cli.nix import nix_shell
+from clan_cli.nix import nix_shell_legacy
 
 from .check import check_secrets
 from .public_modules import FactStoreBase
@@ -39,7 +39,7 @@ def read_multiline_input(prompt: str = "Finish with Ctrl-D") -> str:
 
 def bubblewrap_cmd(generator: str, facts_dir: Path, secrets_dir: Path) -> list[str]:
     # fmt: off
-    return nix_shell(
+    return nix_shell_legacy(
         [
             "nixpkgs#bash",
             "nixpkgs#bubblewrap",

pkgs/clan-cli/clan_cli/facts/secret_modules/password_store.py

@@ -5,7 +5,7 @@ from typing import override
 
 from clan_cli.cmd import Log, RunOpts
 from clan_cli.machines.machines import Machine
-from clan_cli.nix import nix_shell
+from clan_cli.nix import nix_shell_legacy
 
 from . import SecretStoreBase
 
@@ -18,7 +18,7 @@ class SecretStore(SecretStoreBase):
         self, service: str, name: str, value: bytes, groups: list[str]
     ) -> Path | None:
         subprocess.run(
-            nix_shell(
+            nix_shell_legacy(
                 ["nixpkgs#pass"],
                 ["pass", "insert", "-m", f"machines/{self.machine.name}/{name}"],
             ),
@@ -29,7 +29,7 @@ class SecretStore(SecretStoreBase):
 
     def get(self, service: str, name: str) -> bytes:
         return subprocess.run(
-            nix_shell(
+            nix_shell_legacy(
                 ["nixpkgs#pass"],
                 ["pass", "show", f"machines/{self.machine.name}/{name}"],
             ),
@@ -51,7 +51,7 @@ class SecretStore(SecretStoreBase):
         hashes = []
         hashes.append(
             subprocess.run(
-                nix_shell(
+                nix_shell_legacy(
                     ["nixpkgs#git"],
                     [
                         "git",
@@ -71,7 +71,7 @@ class SecretStore(SecretStoreBase):
             if symlink.is_symlink():
                 hashes.append(
                     subprocess.run(
-                        nix_shell(
+                        nix_shell_legacy(
                             ["nixpkgs#git"],
                             [
                                 "git",