DashboardsE2E: Add E2E tests for Auto grid (#106171)

* add auto grid e2e tests

* remove unnecessary clean up in grouping tests

* refaactor repeated code

* Refactor some repeated blocks

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Co-authored-by: kay delaney <kay@grafana.com>

e2e/utils/flows/scenes/editPaneActions.ts

@@ -12,6 +12,14 @@ export const selectRowsLayout = () => {
   clickGroupLayoutButton('Rows');
 };
 
+export const selectCustomGridLayout = () => {
+  clickGroupLayoutButton('Custom');
+};
+
+export const selectAutoGridLayout = () => {
+  clickGroupLayoutButton('Auto grid');
+};
+
 const editPaneCopyOrDuplicate = (buttonLabel: string) => {
   e2e.components.EditPaneHeader.copyDropdown().click();
   cy.get('[role="menu"]').within(() => {