ci: run mobile main tests on the hosted ARM runner PR verify uses (#34611)

Co-authored-by: OrcaWin <293788423+OrcaWin@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>

.github/workflows/mobile.yml

@@ -285,7 +285,7 @@ jobs:
       ORCA_MOBILE_TYPECHECK_COMPILER: 'bun'
     if: github.event_name == 'push'
     # Why ARM: the same pure-Node Vitest run `verify` makes on a pull request.
-    runs-on: blacksmith-4vcpu-ubuntu-2404-arm
+    runs-on: ubuntu-24.04-arm
 
     defaults:
       run: