In terminal context, open new terminals with cmd-n instead of new files (#22253)

Release Notes:

- In terminal context, `cmd-n` and `ctrl-n` now open a new terminal
instead of a new file

assets/keymaps/default-macos.json

@@ -448,7 +448,6 @@
       "cmd-s": "workspace::Save",
       "cmd-k s": "workspace::SaveWithoutFormat",
       "cmd-shift-s": "workspace::SaveAs",
-      "cmd-n": "workspace::NewFile",
       "cmd-shift-n": "workspace::NewWindow",
       "ctrl-`": "terminal_panel::ToggleFocus",
       "cmd-1": ["workspace::ActivatePane", 0],
@@ -495,6 +494,7 @@
     "context": "Workspace && !Terminal",
     "use_key_equivalents": true,
     "bindings": {
+      "cmd-n": "workspace::NewFile",
       "cmd-shift-r": "task::Spawn",
       "cmd-alt-r": "task::Rerun",
       "ctrl-alt-shift-r": ["task::Spawn", { "reveal_target": "center" }]
@@ -761,6 +761,7 @@
       "cmd-v": "terminal::Paste",
       "cmd-a": "editor::SelectAll",
       "cmd-k": "terminal::Clear",
+      "cmd-n": "workspace::NewTerminal",
       "ctrl-enter": "assistant::InlineAssist",
       // Some nice conveniences
       "cmd-backspace": ["terminal::SendText", "\u0015"],