Make it an error to use placeholders of Composeables.

This method doesn't do anything, and not everyone is going to sift through
build log spam to check whether the UI is going to break.

Author: donaldchai

integration/compose/src/main/java/com/bumptech/glide/integration/compose/GlideImage.kt

@@ -329,9 +329,8 @@ public fun placeholder(painter: Painter?): Placeholder =
  * each time the load status changes. Do not use it in scrolling lists.
  */
 @Deprecated(
-  "Using this method forces recomposition when the image load state changes." +
-      " If you require this behavior use GlideSubcomposition instead",
-  level = DeprecationLevel.WARNING
+  "This method doesn't do anything! Use GlideSubcomposition instead",
+  level = DeprecationLevel.ERROR
 )
 @ExperimentalGlideComposeApi
 public fun placeholder(composable: @Composable () -> Unit): Placeholder =