Handle newer "chosenRuntimeBuild" iOS simulator runtime key on devicelab tests - #194509

…lab tests (flutter#194509)

Newer simctl renamed the `preferredBuild` key in `simctl runtime match
list --json` to `chosenRuntimeBuild`. The devicelab only looked for the
old key, so it stopped filtering by the selected Xcode and used whatever
runtime was listed last.

On a machine with Xcode 27.1 installed that was the iOS 27.1 runtime,
which only supports the iPhone Duo device type. `simctl create` for any
iPad or iPhone fails with "Incompatible device".

So:
- Accept `chosenRuntimeBuild` or `preferredBuild` to work on either
version
- Parse `simctl list runtimes --json` and only consider runtimes whose
`supportedDeviceTypes` includes the requested device. Prefer the
selected Xcode's runtime otherwise take the last compatible one. The
`Map<String, Object?>` map parsing was getting crazy and hard to read,
so instead replace with a Dart
[if-case](https://dart.dev/language/branches#if-case) pattern.
- Bump the iPad used by `uiscene_plugin_lifecycle_test_ios` from the 3rd
gen 11-inch Pro to the M4, which should work on Xcode 26 or 27.

Fixes flutter#194147

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