Multiple commands in the Flutter plugin tool have arguments that accepts a list of strings or a list of YAML files that contain a list of strings. This introduces a `getYamlListArg` helper so that this logic doesn't need to be duplicated multiple times.
In a subsequent pull requests, this will be used to add a list of packages that are allowed to have Xcode warnings. This will be used by the google_sign_in_ios package which will have warnings when using SwiftPM.
Part of: https://github.com/flutter/flutter/issues/146904
Adds CI configuration to run web integration tests (in the master channel) compiled to Wasm.
It also removes the `build-examples` step from web integration tests, in some isolated testing:
| platform tests shard | With build-examples | Without build-examples |
|---|-----|-----|
| 1 | 30m | 21m |
| 2 | 13m | 11m |
| 3 | 17m | 10m |
## Issues
* Fixes https://github.com/flutter/flutter/issues/151664
