Enable clippy::clone_on_copy (#8728)

This PR enables the
[`clippy::clone_on_copy`](https://rust-lang.github.io/rust-clippy/master/index.html#/clone_on_copy)
rule and fixes the outstanding violations.

Release Notes:

- N/A

crates/storybook/src/storybook.rs

@@ -42,7 +42,7 @@ fn main() {
     menu::init();
     let args = Args::parse();
 
-    let story_selector = args.story.clone().unwrap_or_else(|| {
+    let story_selector = args.story.unwrap_or_else(|| {
         let stories = ComponentStory::iter().collect::<Vec<_>>();
 
         ctrlc::set_handler(move || {}).unwrap();