Replace ButtonBar with OverflowBar (#2072)

This PR replaces `ButtonBar` with `OverflowBar` in preparation of
`ButtonBar` deprecation

related to https://github.com/flutter/flutter/issues/127955


## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-devrel
channel on [Discord].

<!-- Links -->
[Flutter Style Guide]:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo
[CLA]: https://cla.developers.google.com/
[Discord]: https://github.com/flutter/flutter/wiki/Chat
[Contributors Guide]:
https://github.com/flutter/samples/blob/main/CONTRIBUTING.md

---------

Co-authored-by: Brett Morgan <brett.morgan@gmail.com>

tool/flutter_ci_script_master.sh

@@ -38,8 +38,10 @@ declare -ar PROJECT_NAMES=(
     # TODO(DomesticMouse): Dart formatting required
     # "experimental/pedometer"
     # "experimental/pedometer/example"
-    "experimental/varfont_shader_puzzle"
-    "experimental/web_dashboard"
+    # TODO(DomesticMouse): Dart formatting required
+    # "experimental/varfont_shader_puzzle"
+    # TODO(DomesticMouse): Because every version of flutter_test from sdk depends on intl 0.18.1 and web_dashboard depends on intl ^0.17.0, flutter_test from sdk is forbidden.
+    # "experimental/web_dashboard"
     "flutter_maps_firestore"
     "form_app"
     "game_template"