task: Allow Rerun action to override properties of task being reran (#10468)

For example:
```
"alt-t": [
    "task::Rerun",
     { "reevaluate_context": true, "allow_concurrent_runs": true }
],
```
Overriding `allow_concurrent_runs` to `true` by itself should terminate
current instance of the task, if there's any.

This PR also fixes task deduplication in terminal panel to use expanded
label and not the id, which depends on task context. It kinda aligns
with how task rerun worked prior to #10341 . That's omitted in the
release notes though, as it's not in Preview yet.

Release Notes:

- `Task::Rerun` action can now override `allow_concurrent_runs` and
`use_new_terminal` properties of the task that is being reran.

crates/tasks_ui/src/modal.rs

@@ -38,12 +38,20 @@ impl Spawn {
 /// Rerun last task
 #[derive(PartialEq, Clone, Deserialize, Default)]
 pub struct Rerun {
-    #[serde(default)]
     /// Controls whether the task context is reevaluated prior to execution of a task.
     /// If it is not, environment variables such as ZED_COLUMN, ZED_FILE are gonna be the same as in the last execution of a task
     /// If it is, these variables will be updated to reflect current state of editor at the time task::Rerun is executed.
     /// default: false
+    #[serde(default)]
     pub reevaluate_context: bool,
+    /// Overrides `allow_concurrent_runs` property of the task being reran.
+    /// Default: null
+    #[serde(default)]
+    pub allow_concurrent_runs: Option<bool>,
+    /// Overrides `use_new_terminal` property of the task being reran.
+    /// Default: null
+    #[serde(default)]
+    pub use_new_terminal: Option<bool>,
 }
 
 impl_actions!(task, [Rerun, Spawn]);