Add the ability for tasks to target the center pane

[mikayla-maki]

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:

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