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/Cargo.toml

@@ -61,6 +61,7 @@ ui.workspace = true
 util.workspace = true
 uuid.workspace = true
 strum.workspace = true
+zed_actions.workspace = true
 
 [dev-dependencies]
 call = { workspace = true, features = ["test-support"] }