Add the ability for tasks to target the center pane (#22004)

Closes #20060
Closes #20720
Closes #19873
Closes #9445

Release Notes:

- Fixed a bug where tasks would be spawned with their working directory
set to a file in some cases
- Added the ability to spawn tasks in the center pane, when spawning
from a keybinding:

```json5
[
  {
    // Assuming you have a task labeled "echo hello"
    "ctrl--": [
      "task::Spawn",
      { "task_name": "echo hello", "target": "center" }
    ]
  }
]
```

crates/workspace/src/tasks.rs

@@ -1,15 +1,17 @@
 use project::TaskSourceKind;
 use remote::ConnectionState;
-use task::{ResolvedTask, TaskContext, TaskTemplate};
+use task::{NewCenterTask, ResolvedTask, TaskContext, TaskTemplate};
 use ui::ViewContext;
+use zed_actions::TaskSpawnTarget;
 
 use crate::Workspace;
 
 pub fn schedule_task(
-    workspace: &Workspace,
+    workspace: &mut Workspace,
     task_source_kind: TaskSourceKind,
     task_to_resolve: &TaskTemplate,
     task_cx: &TaskContext,
+    task_target: zed_actions::TaskSpawnTarget,
     omit_history: bool,
     cx: &mut ViewContext<'_, Workspace>,
 ) {
@@ -27,7 +29,7 @@ pub fn schedule_task(
     }
 
     if let Some(spawn_in_terminal) =
-        task_to_resolve.resolve_task(&task_source_kind.to_id_base(), task_cx)
+        task_to_resolve.resolve_task(&task_source_kind.to_id_base(), task_target, task_cx)
     {
         schedule_resolved_task(
             workspace,
@@ -40,12 +42,13 @@ pub fn schedule_task(
 }
 
 pub fn schedule_resolved_task(
-    workspace: &Workspace,
+    workspace: &mut Workspace,
     task_source_kind: TaskSourceKind,
     mut resolved_task: ResolvedTask,
     omit_history: bool,
     cx: &mut ViewContext<'_, Workspace>,
 ) {
+    let target = resolved_task.target;
     if let Some(spawn_in_terminal) = resolved_task.resolved.take() {
         if !omit_history {
             resolved_task.resolved = Some(spawn_in_terminal.clone());
@@ -59,6 +62,18 @@ pub fn schedule_resolved_task(
                 }
             });
         }
-        cx.emit(crate::Event::SpawnTask(Box::new(spawn_in_terminal)));
+
+        match target {
+            TaskSpawnTarget::Center => {
+                cx.dispatch_action(Box::new(NewCenterTask {
+                    action: spawn_in_terminal,
+                }));
+            }
+            TaskSpawnTarget::Dock => {
+                cx.emit(crate::Event::SpawnTask {
+                    action: Box::new(spawn_in_terminal),
+                });
+            }
+        }
     }
 }