m3: impl changed material3 AlertDialog design

- Backup the var#1 to alert_dialog_icon_button_wear_material3.xml
  HSV: https://hsv.googleplex.com/6485117873684480
- Use Buttons with text in button panel to better align with platrform
  AlertDialog's API.
  HSV: https://hsv.googleplex.com/5946369456996352

Flag: android.widget.flags.use_wear_material3_ui
Test: manual
Bug: 379341735
Change-Id: I310acb36d81370be61ad017e85f946a8f99f8b07