Camera2Extensions build issue

[ilionsd]

testInstrumentationRunner in Camera2Extensions/app/build.gradle is set incorrectly to kotlin_version which results in

Execution failed for task ':app:processDebugAndroidTestResources'. A failure occurred while executing com.android.build.gradle.internal.res.LinkApplicationAndroidResourcesTask$TaskAction Android resource linking failed camera-samples\Camera2Extensions\app\build\intermediates\packaged_manifests\debugAndroidTest\AndroidManifest.xml:9: error: attribute 'android:name' in tag must be a valid Java class name.

Setting it to "androidx.test.runner.AndroidJUnitRunner" resolves the issue