[flutter_tools] Use ErrorHandlingFileSystem.deleteIfExists for IOSCoreDeviceControl temp directory cleanup - #195913

…CoreDeviceControl` temp directory cleanup

In `IOSCoreDeviceControl`, `getCoreDevices` (`_listCoreDevices`) used `ErrorHandlingFileSystem.deleteIfExists(tempDirectory, recursive: true)` in its `finally` block (added in flutter#140415), while the remaining 7 `devicectl` helper methods (`_listInstalledApps`, `installApp`, `uninstallApp`, `launchApp`, `terminateProcess`, `_listRunningProcesses`, and `takeScreenshot`) called `tempDirectory.deleteSync(recursive: true)` directly (with `takeScreenshot` wrapping it in `try ... on FileSystemException`).

If `LocalFileSystem` signal cleanup (`_tryToDeleteTemp` on `SIGINT`/`SIGTERM`, as seen in flutter#195733) or external temp cleanup deletes the per-process temp root while `xcrun devicectl` is running, `ErrorHandlingDirectory.deleteSync` rethrows `ENOENT` (`errno = 2`) as an unhandled `PathNotFoundException` from the `finally` block because `ignoreErrorCodes` bypasses `ToolExit` conversion for `kSystemCodeCannotFindFile`.

Replace the remaining 7 `tempDirectory.deleteSync(recursive: true)` calls in `finally` blocks in `packages/flutter_tools/lib/src/ios/core_devices.dart` with `ErrorHandlingFileSystem.deleteIfExists(tempDirectory, recursive: true)` (which also narrows `takeScreenshot`'s cleanup to ignore `ENOENT` rather than all `FileSystemException`s) and add unit tests simulating temp directory deletion during `devicectl` execution.

Previous output (unit test simulating temp directory deletion during `devicectl` before fix):
```
+34 -1: Core Device Control install app Handles FileSystemException deleting temp directory [E]

  FileSystemException: No such file or directory, path = '/.tmp_rand0/core_devices.rand0' (OS Error: No such file or directory, errno = 2)
```

Current output:
```
+87: All tests passed!
```

…deletion test

Match the realistic devicectl interruption path (exitCode: 1) in the getRunningProcesses temp directory deletion unit test so it exercises finally block cleanup after ProcessException rather than raw MemoryFileSystem readAsStringSync.