Remove animation from mover buttons. (#25728)

The animation was intended to better convey direction, and were added as an experiment. It doesn't seem successful, so let's remove it again.

packages/block-editor/src/components/block-list/style.scss

@@ -538,63 +538,20 @@
 	.block-editor-block-mover.is-horizontal .block-editor-block-mover-button.block-editor-block-mover-button {
 		min-width: $block-toolbar-height/2;
 		width: $block-toolbar-height/2;
-
-		// Animate buttons on hover.
-		&.is-up-button {
-			svg {
-				transition: ease-in-out transform 0.1s;
-				@include reduce-motion("transition");
-			}
-			&:focus,
-			&:hover {
-				svg {
-					transform: translateX(-2px);
-				}
-			}
-		}
-
-		&.is-down-button {
-			svg {
-				transition: ease-in-out transform 0.1s;
-				@include reduce-motion("transition");
-			}
-			&:focus,
-			&:hover {
-				svg {
-					transform: translateX(2px);
-				}
-			}
-		}
 	}
 
 	.block-editor-block-mover:not(.is-horizontal) {
-		// Position SVGs. Animate buttons on hover.
+		// Position SVGs.
 		.block-editor-block-mover-button {
 			&.is-up-button {
 				svg {
 					margin-top: 2px;
-					transition: ease-in-out transform 0.1s;
-					@include reduce-motion("transition");
-				}
-				&:focus,
-				&:hover {
-					svg {
-						transform: translateY(-2px);
-					}
 				}
 			}
 
 			&.is-down-button {
 				svg {
 					margin-bottom: 3px;
-					transition: ease-in-out transform 0.1s;
-					@include reduce-motion("transition");
-				}
-				&:focus,
-				&:hover {
-					svg {
-						transform: translateY(2px);
-					}
 				}
 			}