onboarding: Link git clone button with action (#35999)

Release Notes:

- N/A

crates/onboarding/Cargo.toml

@@ -26,6 +26,7 @@ editor.workspace = true
 feature_flags.workspace = true
 fs.workspace = true
 fuzzy.workspace = true
+git.workspace = true
 gpui.workspace = true
 itertools.workspace = true
 language.workspace = true

crates/onboarding/src/welcome.rs

@@ -1,6 +1,6 @@
 use gpui::{
     Action, App, Context, Entity, EventEmitter, FocusHandle, Focusable, InteractiveElement,
-    NoAction, ParentElement, Render, Styled, Window, actions,
+    ParentElement, Render, Styled, Window, actions,
 };
 use menu::{SelectNext, SelectPrevious};
 use ui::{ButtonLike, Divider, DividerColor, KeyBinding, Vector, VectorName, prelude::*};
@@ -38,8 +38,7 @@ const CONTENT: (Section<4>, Section<3>) = (
             SectionEntry {
                 icon: IconName::CloudDownload,
                 title: "Clone a Repo",
-                // TODO: use proper action
-                action: &NoAction,
+                action: &git::Clone,
             },
             SectionEntry {
                 icon: IconName::ListCollapse,