Remove URL from image model.

We decided to pass image content instead in a follow up CL.

Test: manual
Bug: 414869782
Flag: com.android.launcher3.enable_growth_nudge
Change-Id: I05167f81ac7b887cb5e00915f1ffdec0bb2dc720

quickstep/src/com/android/launcher3/taskbar/growth/NudgeController.kt

@@ -95,9 +95,6 @@ class NudgeController(context: Context) : LoggableTaskbarController {
             fun updateImage(image: Image?) {
                 val imageView = requireViewById<ImageView>(R.id.image_view)
                 when (image) {
-                    is Image.Url -> {
-                        // TODO: b/396166097 - Load image from URL.
-                    }
                     is Image.ResourceId -> {
                         imageView.setImageDrawable(context.getDrawable(image.resId))
                     }

quickstep/src/com/android/launcher3/taskbar/growth/NudgePayload.kt

@@ -26,8 +26,6 @@ sealed interface Action {
 
 sealed class Image {
     data class ResourceId(val resId: Int) : Image()
-
-    data class Url(val url: String) : Image()
 }
 
 data class ButtonPayload(val label: String, val actions: List<Action>)