Migrate materialColor* attributes into colors

TLDR:
* This change should not break anything or change any color.
* Simplifies theming and styling while improving developer experience.
* With this  developers can often skip styling for color entirely, while ensuring consistency and preventing accidental overrides.

Bug: 374273611
Test: presubmit
Flag: EXEMPT bugfix
Change-Id: Id19038078e83c73847b1a7c686c3a3df1ecccac2

src/com/android/launcher3/allapps/ActivityAllAppsContainerView.java

@@ -315,8 +315,7 @@ public class ActivityAllAppsContainerView<T extends Context & ActivityContext>
                 0,
                 0 // Bottom left
         };
-        mBottomSheetBackgroundColor =
-                Themes.getAttrColor(getContext(), R.attr.materialColorSurfaceDim);
+        mBottomSheetBackgroundColor = getContext().getColor(R.color.materialColorSurfaceDim);
         updateBackgroundVisibility(mActivityContext.getDeviceProfile());
         mSearchUiManager.initializeSearch(this);
     }