feat(button): add surface-tint-layer-color key to M3 default map

PiperOrigin-RevId: 401382065

Author: allan-chen

components/button/lib/_elevated-button-theme.scss

@@ -35,6 +35,7 @@ $light-theme: map.merge(
     pressed-label-text-color: #fff,
     pressed-state-layer-color: #fff,
     pressed-state-layer-opacity: 0.24,
+    surface-tint-layer-color: transparent,
     with-icon-disabled-icon-color: rgba(#000, 0.38),
     with-icon-focus-icon-color: #fff,
     with-icon-hover-icon-color: #fff,