ui: Update Label component (#24653)

- Standardize style methods
- Convert label story to a component preview
- update component preview styles  

Release Notes:

- N/A

crates/storybook/src/story_selector.rs

@@ -25,7 +25,6 @@ pub enum ComponentStory {
     Icon,
     IconButton,
     Keybinding,
-    Label,
     List,
     ListHeader,
     ListItem,
@@ -61,7 +60,6 @@ impl ComponentStory {
             Self::Icon => cx.new(|_| ui::IconStory).into(),
             Self::IconButton => cx.new(|_| ui::IconButtonStory).into(),
             Self::Keybinding => cx.new(|_| ui::KeybindingStory).into(),
-            Self::Label => cx.new(|_| ui::LabelStory).into(),
             Self::List => cx.new(|_| ui::ListStory).into(),
             Self::ListHeader => cx.new(|_| ui::ListHeaderStory).into(),
             Self::ListItem => cx.new(|_| ui::ListItemStory).into(),