Migrate ios driver tests batch 3 to simulators (#191333)

Part of #186414

This batch migrates 7 Devicelab tests to simulators:
* `integration_test_test_ios`
* `ios_defines_test`
* `keyboard_hot_restart_ios`
* `native_platform_view_ui_tests_ios`
* `platform_channel_sample_test_ios`
* `platform_channel_sample_test_swift`

Changes:
- Moved targets in `.ci.yaml` from `Mac_ios` to `Mac` (Simulator) with
`bringup: true` and injected `ruby` dependency.
- Changed tags to `["devicelab", "hostonly", "mac"]`.
- Wrapped Devicelab tasks with `testWithNewIOSSimulator`.
- Migrated `ios_platform_view_tests` to adopt `UIScene` lifecycle 
- Handled simulator environment battery fallback for `platform_channel`
and `platform_channel_swift`.