terminal: Spawn terminal process on main thread on macos again (#42411)

Closes https://github.com/zed-industries/zed/issues/42365, follow up to
https://github.com/zed-industries/zed/pull/42234

Release Notes:

- N/A *or* Added/Fixed/Improved ...

crates/terminal/src/terminal.rs

@@ -383,7 +383,7 @@ impl TerminalBuilder {
             selection_phase: SelectionPhase::Ended,
             hyperlink_regex_searches: RegexSearches::new(),
             vi_mode_enabled: false,
-            is_ssh_terminal: false,
+            is_remote_terminal: false,
             last_mouse_move_time: Instant::now(),
             last_hyperlink_search_position: None,
             #[cfg(windows)]
@@ -415,7 +415,7 @@ impl TerminalBuilder {
         cursor_shape: CursorShape,
         alternate_scroll: AlternateScroll,
         max_scroll_history_lines: Option<usize>,
-        is_ssh_terminal: bool,
+        is_remote_terminal: bool,
         window_id: u64,
         completion_tx: Option<Sender<Option<ExitStatus>>>,
         cx: &App,
@@ -601,7 +601,7 @@ impl TerminalBuilder {
                 selection_phase: SelectionPhase::Ended,
                 hyperlink_regex_searches: RegexSearches::new(),
                 vi_mode_enabled: false,
-                is_ssh_terminal,
+                is_remote_terminal,
                 last_mouse_move_time: Instant::now(),
                 last_hyperlink_search_position: None,
                 #[cfg(windows)]
@@ -646,7 +646,7 @@ impl TerminalBuilder {
             })
         };
         // the thread we spawn things on has an effect on signal handling
-        if cfg!(target_os = "unix") {
+        if !cfg!(target_os = "windows") {
             cx.spawn(async move |_| fut.await)
         } else {
             cx.background_spawn(fut)
@@ -828,7 +828,7 @@ pub struct Terminal {
     hyperlink_regex_searches: RegexSearches,
     task: Option<TaskState>,
     vi_mode_enabled: bool,
-    is_ssh_terminal: bool,
+    is_remote_terminal: bool,
     last_mouse_move_time: Instant,
     last_hyperlink_search_position: Option<Point<Pixels>>,
     #[cfg(windows)]
@@ -1959,7 +1959,7 @@ impl Terminal {
     }
 
     pub fn working_directory(&self) -> Option<PathBuf> {
-        if self.is_ssh_terminal {
+        if self.is_remote_terminal {
             // We can't yet reliably detect the working directory of a shell on the
             // SSH host. Until we can do that, it doesn't make sense to display
             // the working directory on the client and persist that.
@@ -2158,7 +2158,7 @@ impl Terminal {
             self.template.cursor_shape,
             self.template.alternate_scroll,
             self.template.max_scroll_history_lines,
-            self.is_ssh_terminal,
+            self.is_remote_terminal,
             self.template.window_id,
             None,
             cx,