svg_preview: Remove unnecessary dependency on editor (#43147)

Editor is a choke point in our compilation graph while also being a very
common crate that is being edited. So reducing things that depend on it
will generally improve compilation times for us.

Release Notes:

- N/A *or* Added/Fixed/Improved ...

crates/workspace/src/workspace.rs

@@ -2869,7 +2869,7 @@ impl Workspace {
 
     pub fn active_item_as<I: 'static>(&self, cx: &App) -> Option<Entity<I>> {
         let item = self.active_item(cx)?;
-        item.to_any().downcast::<I>().ok()
+        item.to_any_view().downcast::<I>().ok()
     }
 
     fn active_project_path(&self, cx: &App) -> Option<ProjectPath> {
@@ -11214,7 +11214,7 @@ mod tests {
 
             // Now we can check if the handle we got back errored or not
             assert_eq!(
-                handle.to_any().entity_type(),
+                handle.to_any_view().entity_type(),
                 TypeId::of::<TestPngItemView>()
             );
 
@@ -11227,7 +11227,7 @@ mod tests {
                 .unwrap();
 
             assert_eq!(
-                handle.to_any().entity_type(),
+                handle.to_any_view().entity_type(),
                 TypeId::of::<TestIpynbItemView>()
             );
 
@@ -11276,7 +11276,7 @@ mod tests {
 
             // This _must_ be the second item registered
             assert_eq!(
-                handle.to_any().entity_type(),
+                handle.to_any_view().entity_type(),
                 TypeId::of::<TestAlternatePngItemView>()
             );