Tighten asset variant detection criteria to only include device-pixel-ratio variants by @andrewkolos in https://github.com/flutter/flutter/pull/110721

Use directory exists instead of path.dirname by @Jasguerrero in https://github.com/flutter/flutter/pull/112219

Treat assets as variants only if they share the same filename by @jason-simmons in https://github.com/flutter/flutter/pull/112602

Send progress notifications to clients during hot reload / hot restart by @DanTup in https://github.com/flutter/flutter/pull/112455

Migrate flutter_tools to use package:coverage by @liamappelbe in https://github.com/flutter/flutter/pull/111681