For #25538 - Add "metrics" telemetry for if default wallpaper is shown

app/metrics.yaml

@@ -1518,6 +1518,22 @@ metrics:
       - android-probes@mozilla.com
     expires: 111
     unit: integer
+  default_wallpaper:
+    type: boolean
+    lifetime: application
+    description: |
+      Is the default wallpapper set to be shown?
+    send_in_pings:
+      - metrics
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/25538
+    data_reviews:
+      - ???????
+    data_sensitivity:
+      - interaction
+    notification_emails:
+      - android-probes@mozilla.com
+    expires: 114
 
 customize_home:
   most_visited_sites:

app/src/main/java/org/mozilla/fenix/FenixApplication.kt

@@ -89,6 +89,7 @@ import org.mozilla.fenix.telemetry.TelemetryLifecycleObserver
 import org.mozilla.fenix.utils.BrowsersCache
 import org.mozilla.fenix.utils.Settings
 import org.mozilla.fenix.utils.Settings.Companion.TOP_SITES_PROVIDER_MAX_THRESHOLD
+import org.mozilla.fenix.wallpapers.WallpaperManager
 import java.util.UUID
 import java.util.concurrent.TimeUnit
 
@@ -670,6 +671,8 @@ open class FenixApplication : LocaleAwareApplication(), Provider {
                 packageManager.getInstallerPackageName(packageName)
             }
             installSource.set(installSourcePackage.orEmpty())
+
+            defaultWallpaper.set(WallpaperManager.isDefaultTheCurrentWallpaper(settings))
         }
 
         with(AndroidAutofill) {