test: support run, debug commands in basic NixOS tests

Currently, this only affects the basic NixOS test `clightning-replication`.

test/lib/make-test-vm.nix

@@ -27,4 +27,9 @@ let
     inherit (test) meta passthru;
   } // test;
 in
-  runTest
+  runTest // {
+    # A VM runner for interactive use
+    run = pkgs.writers.writeBashBin "run-vm" ''
+      . ${./run-vm.sh} ${runTest.driver} "$@"
+    '';
+  }

test/lib/make-test.nix

@@ -52,11 +52,6 @@ let
       ];
   };
 
-  # A VM runner for interactive use
-  run = pkgs.writers.writeBashBin "run-vm" ''
-    . ${./run-vm.sh} ${test.driver} "$@"
-  '';
-
   mkContainer = legacyInstallDirs:
     extra-container.lib.buildContainers {
       inherit system legacyInstallDirs;
@@ -139,7 +134,6 @@ let
 in
 test // {
   inherit
-    run
     vm
     container
     # For NixOS with `system.stateVersion` <22.05