[e2e] Fix step source maps assertion for Vercel production (#1672)

Author: VaguelySerious

.changeset/cool-cups-greet.md

@@ -0,0 +1,2 @@
+---
+---

packages/core/e2e/utils.ts

@@ -56,12 +56,9 @@ export function hasStepSourceMaps(): boolean {
     return false;
   }
 
-  // Vercel production builds don't support step source maps
-  if (process.env.WORKFLOW_VERCEL_ENV === 'production') {
-    return false;
-  }
-
-  // Vercel preview builds have proper source maps for all other frameworks, EXCEPT sveltekit
+  // Vercel deployments (both production and preview) have proper source maps
+  // for all frameworks EXCEPT sveltekit, thanks to ESM step bundles with
+  // inline source maps.
   if (!isLocalDeployment()) {
     return appName !== 'sveltekit';
   }