Blueprints Table: Clear selection button now a <Button>

As per discussion with UX, change the `Clear selection` card to a button
(link variant).

src/test/Components/Blueprints/Blueprints.test.js

@@ -195,7 +195,7 @@ describe('Blueprints', () => {
 
       // wait for debounce
       await waitFor(() => {
-        expect(screen.getAllByRole('radio')).toHaveLength(2);
+        expect(screen.getAllByRole('radio')).toHaveLength(1);
       });
     });
   });