Add support for Alt to CharacterActivator, add tests by @gspencergoog in https://github.com/flutter/flutter/pull/113466

[Docs] Clarify that Flex does not wrap by @TzviPM in https://github.com/flutter/flutter/pull/113404

Fix StarBorder operator== by @gspencergoog in https://github.com/flutter/flutter/pull/113588

Add HitTestBehavior to TapRegion by @gspencergoog in https://github.com/flutter/flutter/pull/113634

Use ScrollbarTheme instead Theme for Scrollbar by @Oleh-Sv in https://github.com/flutter/flutter/pull/113237

Add AnimatedIcons previews and examples by @TahaTesser in https://github.com/flutter/flutter/pull/113700