This CL also cleans up and fixes the edit text background setting logic - when the edit text is an autocomplete text view and provides its own background, we won't override the background by trying to add ripples to it.
Later they should be split again from the main class with other box-background-relevant logic.
Resolves https://github.com/material-components/material-components-android/issues/1431
PiperOrigin-RevId: 445486075
