25375 Reland: Call Dart plugin registrant if available (#23813) (cla: yes)

25376 Roll Dart SDK from 5fb4fb907f88 to 6d0a351efd1f (1 revision) (cla: yes, waiting for tree to go green)

25377 Roll Fuchsia Linux SDK from kafCPE8Hd… to AhlA9OIbM… (cla: yes, waiting for tree to go green)

25378 Roll Skia from 42d753031d3f to d4897f0d127e (1 revision) (cla: yes, waiting for tree to go green)

25379 Add fallback for GetAbsoluteFilePath in UWP (affects: desktop, cla: yes, platform-windows, waiting for tree to go green)