Allow running certain Zed actions when headless (#32095)

Rework of https://github.com/zed-industries/zed/pull/30783

Before:

<img width="483" alt="before_1"
src="https://github.com/user-attachments/assets/c08531ce-0c1c-4a91-8375-4542220fc1b1"
/>

<img width="250" alt="before_2"
src="https://github.com/user-attachments/assets/e6f5404e-4e00-4125-bf2b-59a5bc6c41c1"
/>

<img width="369" alt="before_3"
src="https://github.com/user-attachments/assets/6a17c63d-80f6-4d91-a63b-69a9d8fe533a"
/>

After:

<img width="443" alt="after_1"
src="https://github.com/user-attachments/assets/4f7203c2-0065-41da-b7df-02aeba89ab7b"
/>

<img width="246" alt="after_2"
src="https://github.com/user-attachments/assets/585e2e25-bf06-4cdc-bfa5-930e0405c8d0"
/>

<img width="371" alt="after_3"
src="https://github.com/user-attachments/assets/54585f1a-6a9b-45a3-9d77-b0bb1ace580b"
/>


Release Notes:

- Allowed running certain Zed actions when headless

crates/workspace/src/workspace.rs

@@ -7642,6 +7642,33 @@ pub fn ssh_workspace_position_from_db(
     })
 }
 
+pub fn with_active_or_new_workspace(
+    cx: &mut App,
+    f: impl FnOnce(&mut Workspace, &mut Window, &mut Context<Workspace>) + Send + 'static,
+) {
+    match cx.active_window().and_then(|w| w.downcast::<Workspace>()) {
+        Some(workspace) => {
+            cx.defer(move |cx| {
+                workspace
+                    .update(cx, |workspace, window, cx| f(workspace, window, cx))
+                    .log_err();
+            });
+        }
+        None => {
+            let app_state = AppState::global(cx);
+            if let Some(app_state) = app_state.upgrade() {
+                open_new(
+                    OpenOptions::default(),
+                    app_state,
+                    cx,
+                    move |workspace, window, cx| f(workspace, window, cx),
+                )
+                .detach_and_log_err(cx);
+            }
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use std::{cell::RefCell, rc::Rc};