[image] Transparency changes; code refactor (#7908)

tests/components/animation/test.esp32-c3-idf.yaml

@@ -13,12 +13,5 @@ display:
     reset_pin: 10
     invert_colors: false
 
-# Purposely test that `animation:` does auto-load `image:`
-# Keep the `image:` undefined.
-# image:
-
-animation:
-  - id: rgb565_animation
-    file: ../../pnglogo.png
-    type: RGB565
-    use_transparency: false
+packages:
+  animation: !include common.yaml