Merged in feat/SW-2782-create-sas-branded-header (pull request #2878)

feat(SW-2782): Updated header as per design, added language switcher and user menu

* feat(SW-2782): Updated header as per design, added language switcher and user menu

* feat(SW-2782): Updated UI as per design

* feat(SW-2782): Optimised code with use of Popover and modal from RAC


Approved-by: Anton Gunnarsson

apps/partner-sas/components/Menu/NavigationMenu/navigation-menu.module.css

@@ -0,0 +1,50 @@
+.menuItems,
+.menuItem {
+  display: flex;
+  direction: column;
+  align-items: center;
+}
+
+.desktopMenu {
+  display: none;
+}
+
+.menuItem {
+  gap: var(--Space-x1);
+  padding: var(--Space-x1);
+}
+
+.menuDivider {
+  margin: var(--Space-x2) 0;
+}
+
+.contactLink {
+  color: var(--Text-sas-20);
+}
+
+@media screen and (min-width: 768px) {
+  .menuItems,
+  .menuItem {
+    display: flex;
+    align-items: center;
+    padding: 0;
+  }
+
+  .menuItems {
+    gap: var(--Space-x3);
+  }
+
+  .mobileMenu {
+    display: none;
+  }
+
+  .desktopMenu {
+    display: flex;
+    gap: var(--Space-x3);
+    align-items: center;
+  }
+
+  .contactLink {
+    color: white;
+  }
+}