82477 [flutter_tools] make failures to unforward android port non-fatal (tool, cla: yes, waiting for tree to go green)

82478 [flutter_tools] use try to delete in web cache (tool, cla: yes, waiting for tree to go green)

82481 Support uninstall, install status query for UWP (tool, cla: yes)

82484 Fix Android Studio 4.2 detection on Windows (tool, cla: yes, waiting for tree to go green)

82485 Update loader style (tool, cla: yes, waiting for tree to go green)

82494 [flutter_tools] remove mocks from doctor test (tool, cla: yes, waiting for tree to go green)

82498 Replace testUsingContext with testWithoutContext in a few places (team, tool, cla: yes, waiting for tree to go green, a: null-safety)