Allow splitting terminal items in the central pane group (#22088)

Follow-up of https://github.com/zed-industries/zed/pull/22004
Closes https://github.com/zed-industries/zed/issues/22078

Release Notes:

- Fixed splitting terminal items in the center

crates/terminal/src/terminal.rs

@@ -324,6 +324,7 @@ impl TerminalBuilder {
     #[allow(clippy::too_many_arguments)]
     pub fn new(
         working_directory: Option<PathBuf>,
+        python_venv_directory: Option<PathBuf>,
         task: Option<TaskState>,
         shell: Shell,
         mut env: HashMap<String, String>,
@@ -471,6 +472,7 @@ impl TerminalBuilder {
             word_regex: RegexSearch::new(WORD_REGEX).unwrap(),
             vi_mode_enabled: false,
             is_ssh_terminal,
+            python_venv_directory,
         };
 
         Ok(TerminalBuilder {
@@ -619,6 +621,7 @@ pub struct Terminal {
     pub breadcrumb_text: String,
     pub pty_info: PtyProcessInfo,
     title_override: Option<SharedString>,
+    pub python_venv_directory: Option<PathBuf>,
     scroll_px: Pixels,
     next_link_id: usize,
     selection_phase: SelectionPhase,