Update analysis_options.yaml

[swift-kim]

Recently in the upstream repo, some updates have been made to the analysis_options.yaml file and example apps. We need to sync our code again accordingly.

https://github.com/flutter/plugins/commits/main/analysis_options.yaml

[swift-kim]

@bbrto21 @bwikbs @seungsoo47 Could you remove references to analysis_options_legacy.yaml in camera_tizen, google_maps_flutter_tizen, and webview_flutter_tizen as well? You will first need to resync all their Dart code (the example app and etc.) and update app-facing and platform interface packages as I've done in #392.

[bbrto21]

@swift-kim
I'll check camera_tizen but depending on my work priority, this may be processed late.
Is that okay?

[swift-kim]

@bbrto21 That's okay. This whole work is a quite demanding task and my expectation is that it will take at least a month to close this issue.