* Update to WinUI 2.6
Co-authored-by: Han Zhang <zhangh@microsoft.com>
Co-authored-by: Kenny Guo <kennyguo@microsoft.com>
**Description of the changes:**
1. Update to WinUI 2.6 styles and controls #1606.
2. Add Mica Material #1611.
3. Add Settings page #596.
4. Fix Ctrl+E shortcuts in AoT mode #1590.
**How changes were validated:**
Passed build, UT/UI test and manually tested.
* Fixed the display issue in AOT mode (#1615)
* Fixed the display issue in AOT mode
* Get the OpenPaneLength from the resource
* Fix CalendarView style in DateCalculation of dark mode (#1616)
* Fix a style problem of Date Calculator, and clean some unused codes
* Remove some unused codes
* Disable Mica before close the window to resolve a crash (#1619)
* Bump internal package build number (#1621)
