task: use full task label to distinguish a terminal (#10469)

Spotted by @SomeoneToIgnore, in #10468 I've used a shortened task label,
which might lead to collisions.

Release Notes:

- N/A

crates/terminal/src/terminal.rs

@@ -288,6 +288,7 @@ impl Display for TerminalError {
 
 pub struct SpawnTask {
     pub id: TaskId,
+    pub full_label: String,
     pub label: String,
     pub command: String,
     pub args: Vec<String>,
@@ -594,6 +595,7 @@ pub struct Terminal {
 
 pub struct TaskState {
     pub id: TaskId,
+    pub full_label: String,
     pub label: String,
     pub status: TaskStatus,
     pub completion_rx: Receiver<()>,
@@ -1363,7 +1365,7 @@ impl Terminal {
                 if truncate {
                     truncate_and_trailoff(&task_state.label, MAX_CHARS)
                 } else {
-                    task_state.label.clone()
+                    task_state.full_label.clone()
                 }
             }
             None => self