feat(frame): handle back navigation when common layout is used as a root element (#5608)

* test(e2e): update modal navigation app

Add layout as root.
Add show modal layout.

* chore(frame): move frame stack modifiers in a separate frame-stack module

* feat(frame): handle back navigation when using common layout as root element

e2e/modal-navigation/app/modal-layout/modal-layout.ts

@@ -0,0 +1,23 @@
+export function onShowingModally() {
+    console.log("modal-layout showingModally");
+}
+
+export function onLoaded() {
+    console.log("modal-layout loaded");
+}
+
+export function onNavigatingTo() {
+    console.log("modal-layout onNavigatingTo");
+}
+
+export function onNavigatingFrom() {
+    console.log("modal-layout onNavigatingFrom");
+}
+
+export function onNavigatedTo() {
+    console.log("modal-layout onNavigatedTo");
+}
+
+export function onNavigatedFrom() {
+    console.log("modal-layout onNavigatedFrom");
+}

e2e/modal-navigation/app/modal-layout/modal-layout.xml

@@ -0,0 +1,7 @@
+<GridLayout backgroundColor="green" showingModally="onShowingModally" loaded="onLoaded"
+    navigatingTo="onNavigatingTo"
+    navigatingFrom="onNavigatingFrom"
+    navigatedTo="onNavigatedTo"
+    navigatedFrom="onNavigatedFrom">
+    <Frame defaultPage="modal/modal-page"></Frame>
+</GridLayout>