Remove scrolling of empty image blocks (#59305)

Co-authored-by: torounit <toro_unit@git.wordpress.org>
Co-authored-by: fabiankaegy <fabiankaegy@git.wordpress.org>
Co-authored-by: hanneslsm <hanneslsm@git.wordpress.org>
Co-authored-by: talldan <talldanwp@git.wordpress.org>

packages/block-library/src/image/editor.scss

@@ -1,6 +1,12 @@
 // Provide special styling for the placeholder.
 // @todo: this particular minimal style of placeholder could be componentized further.
 .wp-block-image.wp-block-image {
+
+	&:not(.is-selected) .components-placeholder__fieldset {
+		// Show only is selected.
+		display: none;
+	}
+
 	// Show Placeholder style on-select.
 	&.is-selected .components-placeholder {
 		// Block UI appearance.