Use split direction preferences more (#16679)

Use new split direction preferences in more places (#16345)

Release Notes:

- N/A

crates/workspace/src/workspace.rs

@@ -136,6 +136,8 @@ actions!(
         FollowNextCollaborator,
         NewCenterTerminal,
         NewFile,
+        NewFileSplitVertical,
+        NewFileSplitHorizontal,
         NewSearch,
         NewTerminal,
         NewWindow,
@@ -168,9 +170,6 @@ pub struct ActivatePaneInDirection(pub SplitDirection);
 #[derive(Clone, Deserialize, PartialEq)]
 pub struct SwapPaneInDirection(pub SplitDirection);
 
-#[derive(Clone, Deserialize, PartialEq)]
-pub struct NewFileInDirection(pub SplitDirection);
-
 #[derive(Clone, PartialEq, Debug, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct SaveAll {
@@ -220,7 +219,6 @@ impl_actions!(
         ActivatePaneInDirection,
         CloseAllItemsAndPanes,
         CloseInactiveTabsAndPanes,
-        NewFileInDirection,
         OpenTerminal,
         Reload,
         Save,