refactor: hide dashboard spacing api temporarily (#6831)

* refactor: hide dashboard spacing api temporarily

* fix: make helpers public

* fix: make helpers public

* test: revert deletion of helper and use spacing property directly

Author: ugur-vaadin

vaadin-dashboard-flow-parent/vaadin-dashboard-flow-integration-tests/src/main/java/com/vaadin/flow/component/dashboard/tests/DashboardItemResizePage.java

@@ -26,7 +26,8 @@ public DashboardItemResizePage() {
         dashboard.setMinimumRowHeight("200px");
         dashboard.setMinimumColumnWidth("250px");
         dashboard.setMaximumColumnWidth("250px");
-        dashboard.setSpacing("0px");
+        // Use setSpacing when it is made public
+        getStyle().set("--vaadin-dashboard-spacing", "0px");
 
         DashboardWidget widget = new DashboardWidget();
         widget.setTitle("Widget");

vaadin-dashboard-flow-parent/vaadin-dashboard-flow/src/main/java/com/vaadin/flow/component/dashboard/Dashboard.java

@@ -44,7 +44,7 @@
  * Dashboard is a responsive layout component that allows users to organize
  * widgets either directly within the dashboard or optionally group them into
  * sections. The component supports customizable layout options like maximum
- * column count and spacing.
+ * column count.
  * <p>
  * Internationalization (i18n) is supported through {@link DashboardI18n},
  * allowing customization of accessible names for the dashboard controls. The
@@ -319,7 +319,7 @@ public void setMinimumRowHeight(String minRowHeight) {
      *
      * @return the spacing of the dashboard
      */
-    public String getSpacing() {
+    String getSpacing() {
         return getStyle().get("--vaadin-dashboard-spacing");
     }
 
@@ -331,7 +331,7 @@ public String getSpacing() {
      *            the new spacing. Pass in {@code null} to set the spacing back
      *            to the default value.
      */
-    public void setSpacing(String spacing) {
+    void setSpacing(String spacing) {
         getStyle().set("--vaadin-dashboard-spacing", spacing);
     }