For #26401: Remove unused wallpaper metrics.

Remove wallpaper_switched and change_wallpaper_logo_toggled.
Add lint ignore for common prefix in wallpaper metrics.

app/metrics.yaml

@@ -7844,6 +7844,8 @@ wallpapers:
     data_sensitivity:
       - interaction
     expires: 114
+    no_lint:
+      - COMMON_PREFIX
     metadata:
       tags:
         - Wallpapers
@@ -7867,50 +7869,8 @@ wallpapers:
     data_sensitivity:
       - interaction
     expires: 114
-    metadata:
-      tags:
-        - Wallpapers
-  wallpaper_switched:
-    type: event
-    description: |
-      The wallpaper was switched by using the homescreen toggle.
-    extra_keys:
-      name:
-        description: The name of the new wallpaper
-        type: string
-      theme_collection:
-        description: The theme collection the new wallpaper belongs to.
-        type: string
-    bugs:
-      - https://github.com/mozilla-mobile/fenix/issues/23381
-    data_reviews:
-      - https://github.com/mozilla-mobile/fenix/pull/23382
-    notification_emails:
-      - android-probes@mozilla.com
-    data_sensitivity:
-      - interaction
-    expires: 114
-    metadata:
-      tags:
-        - Wallpapers
-  change_wallpaper_logo_toggled:
-    type: event
-    description: |
-      A user has toggled the switch that controls the tap-logo-to-change-
-      wallpaper feature.
-    extra_keys:
-      checked:
-        description: Whether the switch is enabled or disabled.
-        type: boolean
-    bugs:
-      - https://github.com/mozilla-mobile/fenix/issues/23381
-    data_reviews:
-      - https://github.com/mozilla-mobile/fenix/pull/23382
-    notification_emails:
-      - android-probes@mozilla.com
-    data_sensitivity:
-      - interaction
-    expires: 114
+    no_lint:
+      - COMMON_PREFIX
     metadata:
       tags:
         - Wallpapers