MapUserStyleObserver does not handle local JSON styles

Nobody has claimed this yet.

**Android API: 33**
**Mapbox Navigation SDK version: 3.0.4**

### Steps to trigger behavior

1. Use the `android-auto` example from [this repo](https://github.com/mapbox/mapbox-navigation-android-examples/tree/main) as a basis.
2. Load a map style from a local JSON file in `android-auto-app/src/main/java/com/mapbox/navigation/examples/androidauto/car/MainCarSession.kt`
3. Search a route to a destination and start a trip.

### Expected behavior
Navigation SDK for Android Auto should handle both cloud-based as well as local JSON styles.

### Actual behavior
The following error is thrown:
```
java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
at java.util.Collections$SingletonList.get(Collections.java:5042)
at com.mapbox.navigation.ui.androidauto.navigation.MapUserStyleObserver.updateState(MapUserStyleObserver.kt:29)
at com.mapbox.navigation.ui.androidauto.navigation.MapUserStyleObserver.onAttached(MapUserStyleObserver.kt:19)
at com.mapbox.navigation.ui.androidauto.navigation.roadlabel.CarRoadLabelRenderer.onAttached(CarRoadLabelRenderer.kt:77)
at com.mapbox.maps.extension.androidauto.CarMapSurfaceOwner.registerObserver$extension_androidauto_release(CarMapSurfaceOwner.kt:54)
at com.mapbox.maps.extension.androidauto.MapboxCarMap.registerObserver(MapboxCarMap.kt:149)
at com.mapbox.navigation.ui.androidauto.freedrive.FreeDriveCarScreen$1.onResume(FreeDriveCarScreen.kt:46)
at androidx.lifecycle.DefaultLifecycleObserverAdapter.onStateChanged(DefaultLifecycleObserverAdapter.kt:26)
at androidx.lifecycle.LifecycleRegistry$ObserverWithState.dispatchEvent(LifecycleRegistry.jvm.kt:320)
at androidx.lifecycle.LifecycleRegistry.forwardPass(LifecycleRegistry.jvm.kt:257)
at androidx.lifecycle.LifecycleRegistry.sync(LifecycleRegistry.jvm.kt:293)
at androidx.lifecycle.LifecycleRegistry.moveToState(LifecycleRegistry.jvm.kt:142)
at androidx.lifecycle.LifecycleRegistry.handleLifecycleEvent(LifecycleRegistry.jvm.kt:124)
at androidx.car.app.Screen.lambda$dispatchLifecycleEvent$1$androidx-car-app-Screen(Screen.java:340)
at androidx.car.app.Screen$$ExternalSyntheticLambda1.run(Unknown Source:4)
at androidx.car.app.utils.ThreadUtils.runOnMain(ThreadUtils.java:38)
at androidx.car.app.Screen.dispatchLifecycleEvent(Screen.java:328)
at androidx.car.app.ScreenManager.popInternal(ScreenManager.java:375)
at androidx.car.app.ScreenManager.popToRoot(ScreenManager.java:216)
at com.mapbox.navigation.ui.androidauto.screenmanager.MapboxScreenManager.replaceTop(MapboxScreenManager.kt:235)
at com.mapbox.navigation.ui.androidauto.screenmanager.MapboxScreenManager.onReplaceTop(MapboxScreenManager.kt:230)
at com.mapbox.navigation.ui.androidauto.screenmanager.MapboxScreenManager.onScreenEvent(MapboxScreenManager.kt:210)
at com.mapbox.navigation.ui.androidauto.screenmanager.MapboxScreenManager.access$onScreenEvent(MapboxScreenManager.kt:68)
at com.mapbox.navigation.ui.androidauto.screenmanager.MapboxScreenManager$lifecycleObserver$1$onCreate$1$1.emit(MapboxScreenManager.kt:81)
at com.mapbox.navigation.ui.androidauto.screenmanager.MapboxScreenManager$lifecycleObserver$1$onCreate$1$1.emit(MapboxScreenManager.kt:81)
at kotlinx.coroutines.flow.SharedFlowImpl.collect$suspendImpl(SharedFlow.kt:382)
at kotlinx.coroutines.flow.SharedFlowImpl$collect$1.invokeSuspend(Unknown Source:15)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTaskKt.resume(DispatchedTask.kt:235)
at kotlinx.coroutines.DispatchedTaskKt.resumeUnconfined(DispatchedTask.kt:191)
at kotlinx.coroutines.DispatchedTaskKt.dispatch(DispatchedTask.kt:163)
at kotlinx.coroutines.CancellableContinuationImpl.dispatchResume(CancellableContinuationImpl.kt:474)
at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl(CancellableContinuationImpl.kt:508)
at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl$default(CancellableContinuationImpl.kt:497)
at kotlinx.coroutines.CancellableContinuationImpl.resumeWith(CancellableContinuationImpl.kt:368)
at kotlinx.coroutines.flow.SharedFlowImpl.tryEmit(SharedFlow.kt:399)
at com.mapbox.navigation.ui.androidauto.screenmanager.MapboxScreenManager$Companion.replaceTop(MapboxScreenManager.kt:292)
at com.mapbox.navigation.ui.androidauto.preview.CarRoutePreviewScreen.onGetTemplate$lambda$2(CarRoutePreviewScreen.kt:128)
at com.mapbox.navigation.ui.androidauto.preview.CarRoutePreviewScreen.$r8$lambda$cjvY8ej50Xno8ZQZK_I0s37EBd0(Unknown Source:0)
at com.mapbox.navigation.ui.androidauto.preview.CarRoutePreviewScreen$$ExternalSyntheticLambda1.onClick(Unknown Source:2)
at androidx.car.app.model.OnClickDelegateImpl$OnClickListenerStub.lambda$onClick$0$androidx-car-app-model-OnClickDelegateImpl$OnClickListenerStub(OnClickDelegateImpl.java:96)
at androidx.car.app.model.OnClickDelegateImpl$OnClickListenerStub$$ExternalSyntheticLambda0.dispatch(Unknown Source:2)
at androidx.car.app.utils.RemoteUtils.lambda$dispatchCallFromHost$0(RemoteUtils.java:148)
at androidx.car.app.utils.RemoteUtils$$ExternalSyntheticLambda1.run(Unknown Source:6)
at android.os.Handler.handleCallback(Handler.java:942)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:226)
at android.os.Looper.loop(Looper.java:313)
at android.app.ActivityThread.main(ActivityThread.java:8762)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:604)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)
Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@67854e4, Dispatchers.Main.immediate]
```
As far as I can tell, the reason seems to be [this expectation](https://github.com/mapbox/mapbox-navigation-android/blob/b33ee3d2f13a349065af378dc0bd45b3777e1858/libnavui-androidauto/src/main/java/com/mapbox/androidauto/navigation/MapUserStyleObserver.kt#L28) of an URL scheme.

Start with MapUserStyleObserver.kt at the referenced line and inspect how the style URL is handled when the style is loaded from MainCarSession.kt. Reproduce the Android Auto flow with a local JSON style, then verify that both local JSON and cloud-based styles avoid the reported IndexOutOfBoundsException.

Written by the indexing model from the issue text.