Make tests less noisy (#12463)

When running the tests for linux, I found a lot of benign errors getting
logged. This PR cuts down some of the noise from unnecessary workspace
serialization and SVG renders

Release Notes:

- N/A

crates/storybook/src/assets.rs

@@ -15,10 +15,11 @@ use rust_embed::RustEmbed;
 pub struct Assets;
 
 impl AssetSource for Assets {
-    fn load(&self, path: &str) -> Result<Cow<'static, [u8]>> {
+    fn load(&self, path: &str) -> Result<Option<Cow<'static, [u8]>>> {
         Self::get(path)
             .map(|f| f.data)
             .ok_or_else(|| anyhow!("could not find asset at path \"{}\"", path))
+            .map(|data| Some(data))
     }
 
     fn list(&self, path: &str) -> Result<Vec<SharedString>> {

crates/storybook/src/storybook.rs

@@ -128,7 +128,10 @@ fn load_embedded_fonts(cx: &AppContext) -> gpui::Result<()> {
     let mut embedded_fonts = Vec::new();
     for font_path in font_paths {
         if font_path.ends_with(".ttf") {
-            let font_bytes = cx.asset_source().load(&font_path)?;
+            let font_bytes = cx
+                .asset_source()
+                .load(&font_path)?
+                .expect("Should never be None in the storybook");
             embedded_fonts.push(font_bytes);
         }
     }