[custom-devices] general improvements, add custom-devices subcommand, better error handling (#82043)

98dc750f1 Roll Dart SDK from 8ad824d8b114 to 4422591ed19b (1 revision) (flutter/engine#27186) (#85976)

c1ce39ecb Roll Dart SDK from 2758c89236ac to 4c71ad843de0 (1 revision) (flutter/engine#27179) (#85936)

569f0d1d6 Roll Dart SDK from f99e4033de1a to 9b7b9f735866 (1 revision) (flutter/engine#27173) (#85913)

6abd58286 Roll Dart SDK from 559da0f2d2a4 to f99e4033de1a (1 revision) (flutter/engine#27171) (#85899)

f466cccab [flutter_plugin_tools] Add --packages, and deprecated --plugins (flutter/plugins#4134) (#85866)

338ec6be0 Roll Dart SDK from f860b70c98d0 to 559da0f2d2a4 (5 revisions) (flutter/engine#27161) (#85843)

679a7adb3 Follow up cleanup of some unit tests for right click handling. (flutter/engine#27152) (#85817)

* e94ed1cc3 [web] skip overlay test on Safari (flutter/engine#27114)

* 6b9284203 Roll Skia from 1c467774e56e to e9ab391765c7 (1 revision) (flutter/engine#27143)

* 097790627 Update goldens test for Thai. (flutter/engine#27144)

* 4ec5781d8 [web] replace browser-related conditional logic with BrowserEnvironment (flutter/engine#27084)

* 05ce70ebb enable DisplayList by default (flutter/engine#27130)

* e3357d252 Roll Fuchsia Mac SDK from jzKy-rCeR... to oiyYFMOd3... (flutter/engine#27145)

* cb1c312b4 Support right-clicking on iPadOS (flutter/engine#27019)

* 4ac4e5cc2 Roll Fuchsia Linux SDK from 4MLcvcjCH... to QbIpQIqxK... (flutter/engine#27146)

* e6250f7a4 Roll Skia from e9ab391765c7 to 04d79fc59488 (1 revision) (flutter/engine#27148)

* 2dacffa42 Revert "enable DisplayList by default (#27130)" (flutter/engine#27153)