Add splashRadius to PopupMenuButton by @Moluram in https://github.com/flutter/flutter/pull/91148

[framework] make HitTestEntry generic by @jonahwilliams in https://github.com/flutter/flutter/pull/97175

Mirror before scaling in _AnimatedIconPainter by @Amir-P in https://github.com/flutter/flutter/pull/93312

Flutter web add support for NetworkImage headers by @jonas-martinez in https://github.com/flutter/flutter/pull/85954

Re-land “Support Scribble Handwriting” (#96615) by @fbcouch in https://github.com/flutter/flutter/pull/96881

Revert the Scribble reland by @justinmc in https://github.com/flutter/flutter/pull/97405