Suppress "All plugins found for ios are Swift Packages, but your project still has CocoaPods integration" error for plugin example projects #151504
Description
I just built packages/go_router/example and I see:
$ flutter build ios
All plugins found for ios are Swift Packages, but your project still has CocoaPods integration. Your project uses a non-standard Podfile and will need to be migrated to Swift Package Manager manually. Some steps you may need to complete include:
* In the ios/ directory run "pod deintegrate"
* Transition any Pod dependencies to Swift Package equivalents. See https://developer.apple.com/documentation/xcode/adding-package-dependencies-to-your-app
* Transition any custom logic
* Remove the include to "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig" in your ios/Flutter/Debug.xcconfig
* Remove the include to "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig" in your ios/Flutter/Release.xcconfig
Removing CocoaPods integration will improve the project's build time.
Building com.example.example for device (ios-release)...
However, we want plugin authors to continue to support both CocoaPods and SwiftPM for the foreseeable future. Can we detect the example project is in a plugin directory, and suppress the warning in that case?
/cc @loic-sharma