onboarding: Actions for page navigation (#35484)

Closes #ISSUE

Release Notes:

- N/A *or* Added/Fixed/Improved ...

assets/keymaps/default-linux.json

@@ -1168,5 +1168,14 @@
       "up": "menu::SelectPrevious",
       "down": "menu::SelectNext"
     }
+  },
+  {
+    "context": "Onboarding",
+    "use_key_equivalents": true,
+    "bindings": {
+      "ctrl-1": "onboarding::ActivateBasicsPage",
+      "ctrl-2": "onboarding::ActivateEditingPage",
+      "ctrl-3": "onboarding::ActivateAISetupPage"
+    }
   }
 ]

assets/keymaps/default-macos.json

@@ -1270,5 +1270,14 @@
       "up": "menu::SelectPrevious",
       "down": "menu::SelectNext"
     }
+  },
+  {
+    "context": "Onboarding",
+    "use_key_equivalents": true,
+    "bindings": {
+      "cmd-1": "onboarding::ActivateBasicsPage",
+      "cmd-2": "onboarding::ActivateEditingPage",
+      "cmd-3": "onboarding::ActivateAISetupPage"
+    }
   }
 ]