Move task centering code closer to user input (#22082)

Follow-up of https://github.com/zed-industries/zed/pull/22004 

* Reuse center terminals for tasks, when requested
* Extend task templates with `RevealTarget`, moving it from
`TaskSpawnTarget` into the core library
* Use `reveal_target` instead of `target` to avoid misinterpretations in
the task template context
* Do not expose `SpawnInTerminal` to user interface, avoid it
implementing `Serialize` and `Deserialize`
* Remove `NewCenterTask` action, extending `task::Spawn` interface
instead
* Do not require any extra unrelated parameters during task resolution,
instead, use task overrides on the resolved tasks on the modal side
* Add keybindings for opening the task modal in the
`RevealTarget::Center` mode

Release Notes:

- N/A

crates/workspace/Cargo.toml

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

crates/workspace/src/tasks.rs

@@ -1,8 +1,7 @@
 use project::TaskSourceKind;
 use remote::ConnectionState;
-use task::{NewCenterTask, ResolvedTask, TaskContext, TaskTemplate};
+use task::{ResolvedTask, TaskContext, TaskTemplate};
 use ui::ViewContext;
-use zed_actions::TaskSpawnTarget;
 
 use crate::Workspace;
 
@@ -11,7 +10,6 @@ pub fn schedule_task(
     task_source_kind: TaskSourceKind,
     task_to_resolve: &TaskTemplate,
     task_cx: &TaskContext,
-    task_target: zed_actions::TaskSpawnTarget,
     omit_history: bool,
     cx: &mut ViewContext<'_, Workspace>,
 ) {
@@ -29,7 +27,7 @@ pub fn schedule_task(
     }
 
     if let Some(spawn_in_terminal) =
-        task_to_resolve.resolve_task(&task_source_kind.to_id_base(), task_target, task_cx)
+        task_to_resolve.resolve_task(&task_source_kind.to_id_base(), task_cx)
     {
         schedule_resolved_task(
             workspace,
@@ -48,7 +46,6 @@ pub fn schedule_resolved_task(
     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());
@@ -63,17 +60,8 @@ pub fn schedule_resolved_task(
             });
         }
 
-        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),
-                });
-            }
-        }
+        cx.emit(crate::Event::SpawnTask {
+            action: Box::new(spawn_in_terminal),
+        });
     }
 }