test(ci, ios): try more powerful runner + yeetd, possible de-flake

.github/workflows/tests_e2e_ios.yml

@@ -20,7 +20,7 @@ concurrency:
 jobs:
   ios:
     name: iOS
-    runs-on: macos-14
+    runs-on: macos-14-xlarge
     # TODO matrix across APIs, at least 10 and 13 (lowest to highest)
     timeout-minutes: 100
     env:
@@ -38,6 +38,13 @@ jobs:
         with:
           xcode-version: 'latest-stable'
 
+      # https://bitrise.io/blog/post/xcode-15-performance-regressions
+      - name: Install yeetd
+        run: |
+          wget https://github.com/biscuitehh/yeetd/releases/download/1.0/yeetd-normal.pkg
+          sudo installer -pkg yeetd-normal.pkg -target /
+          yeetd &
+
       - name: Start Simulator
         # The first time you try to `yarn run:ios` after xcode-select, it fails, so get it out of the way...
         continue-on-error: true