Fix iOS E2E Tests (#48400)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/48400

A couple of days ago, the iOS CI started failing for the E2E tests on main.
This is because We were not using the hermes artifacts we were preconfiguring.

In fact, this is the log of the `test_e2e_ios_rntester`, which is not using the prebuilt.
{F1974129000}

For comparison, this is the `test_ios_rntester`, which is using the prebuilt
{F1974129001}

While investigating why this was happening, I realized that we were not testing the old architecture anymore, because we forget to update the script after the release of the New Architecture.

This change should fix both.

## Changelog:
[Internal] - Fix E2E tests for iOS and test the Old Arch

Reviewed By: robhogan

Differential Revision: D67670976

fbshipit-source-id: 7d1383a89e06c138f437a9c5f876a2e900878fb0

.github/actions/test-ios-rntester/action.yml

@@ -109,8 +109,8 @@ runs:
           export USE_FRAMEWORKS=dynamic
         fi
 
-        if [[ ${{ inputs.architecture }} == "NewArch" ]]; then
-          export RCT_NEW_ARCH_ENABLED=1
+        if [[ ${{ inputs.architecture }} == "OldArch" ]]; then
+          export RCT_NEW_ARCH_ENABLED=0
         fi
 
         cd packages/rn-tester