Register repl actions with editor after session started (#20396)

Makes repl actions that are specific to running kernels only come up
after a session has been started at least once for the editor.

Release Notes:

- Only show session oriented `repl::` actions for editors after a
session has been created

crates/repl/src/session.rs

@@ -1,4 +1,5 @@
 use crate::components::KernelListItem;
+use crate::setup_editor_session_actions;
 use crate::{
     kernels::{Kernel, KernelSpecification, RunningKernel},
     outputs::{ExecutionStatus, ExecutionView},
@@ -207,6 +208,14 @@ impl Session {
             None => Subscription::new(|| {}),
         };
 
+        let editor_handle = editor.clone();
+
+        editor
+            .update(cx, |editor, _cx| {
+                setup_editor_session_actions(editor, editor_handle);
+            })
+            .ok();
+
         let mut session = Self {
             fs,
             editor,