Fixing examples test app LocationComponent race condition

[JunDai]

Description

Fix #2942

The locationComponent is initialized until navigationMapboxMap been created. So not assign mapboxMap variable until style is loaded and everything is set up.

    override fun onMapReady(mapboxMap: MapboxMap) {
        mapboxMap.setStyle(Style.MAPBOX_STREETS) {
            mapboxMap.moveCamera(CameraUpdateFactory.zoomTo(15.0))
            navigationMapboxMap = NavigationMapboxMap(mapView, mapboxMap, true)
            this.mapboxMap = mapboxMap
        }

• I have added any issue links
• I have added all related labels (bug, feature, new API(s), SEMVER, etc.)
• I have added the appropriate milestone and project boards

Testing

Please describe the manual tests that you ran to verify your changes

• I have tested locally (including SNAPSHOT upstream dependencies if needed) through testapp/demo app and run all activities to avoid regressions
• I have tested via a test drive, or a simulation/mock location app
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have updated the CHANGELOG including this PR

[kmadsen]

Is this needed by any other examples?

[kmadsen]

Some crashes are exchanged with no-op bugs?

[LukasPaczos]

The locationComponent is initialized until navigationMapboxMap been created.

That's definitely the reason of the crash.

I think it might be easier to understand the fix if LocationComponent#isLocationComponentActivated was used before calling

mapbox-navigation-android/examples/src/main/java/com/mapbox/navigation/examples/core/FasterRouteActivity.kt

Line 294 in 462a94e

activityRef.get()?.mapboxMap?.locationComponent?.forceLocationUpdate(it)

instead of reshuffling the initialization of variables.

[JunDai]

The locationComponent is initialized until navigationMapboxMap been created.

That's definitely the reason of the crash.

I think it might be easier to understand the fix if LocationComponent#isLocationComponentActivated was used before calling

mapbox-navigation-android/examples/src/main/java/com/mapbox/navigation/examples/core/FasterRouteActivity.kt

Line 294 in 462a94e

activityRef.get()?.mapboxMap?.locationComponent?.forceLocationUpdate(it)

instead of reshuffling the initialization of variables.

sounds good, changed the fix and verified it works!

[JunDai]

Is this needed by any other examples?

no, I checked our other examples.

[langsmith]

Above the class FasterRouteActivity : AppCompatActivity(), OnMapReadyCallback { line, can we add:

/**
 * This example shows how to use the Navigation SDK's [FasterRouteObserver]
 * and display the observer's faster routes that are returned if the 
 * device goes off of the original [DirectionsRoute].
 */