Optimize iOS build pipeline: Increase RAM, Skip Pods, Fix Shell Scripts.

- Increased ByteCodeTranslator heap size to 2048MB in IPhoneBuilder to address potential memory bottlenecks.
- Made `pod install` conditional in IPhoneBuilder; it now skips if not required or if `ios.pods.skipInstall` is set, reducing build overhead.
- Refactored `scripts/build-ios-app.sh` and `scripts/run-ios-ui-tests.sh` to remove `eval` and correctly handle arguments with spaces (like simulator names), preventing syntax errors.
- Updated iOS build scripts to fallback to `.xcodeproj` if `.xcworkspace` is missing (due to skipped pods).
- Updated `.github/workflows/scripts-ios.yml` to use `iPhone 15` as the simulator destination to fix CI failures on runners where `iPhone 16` is unavailable.

Author: google-labs-jules[bot]

.github/workflows/scripts-ios.yml

@@ -119,7 +119,7 @@ jobs:
       - name: Run iOS UI screenshot tests
         env:
           ARTIFACTS_DIR: ${{ github.workspace }}/artifacts
-          IOS_SIM_DESTINATION: platform=iOS Simulator,name=iPhone 16 Pro,OS=18.5
+          IOS_SIM_DESTINATION: platform=iOS Simulator,name=iPhone 15
         run: |
           set -euo pipefail
           mkdir -p "${ARTIFACTS_DIR}"