flutter screenshot should not require being run from a Flutter project directory #115790
Description
$ cd $HOME # not a Flutter directory
$ flutter screenshot
No supported devices connected.
The following devices were found, but are not supported by this project:
Purple 14 (mobile) • 00008110-0009588C2651401E • ios • iOS 16.1.1
20B101
macOS (desktop) • macos • darwin-x64 • macOS 12.6.1
21G217 darwin-x64
Chrome (web) • chrome • web-javascript • Google Chrome
107.0.5304.110
If you would like your app to run on ios or macos or web, consider running
`flutter create .` to generate projects for these platforms.
flutter screenshot seems to be checking the enabled devices for the project, but it would be good to be able to run that one from anywhere.
See also #35490