* Add optional param to useRootNavigator when showSearch

* Add test showSearch with rootNavigator

* fix analyze

* Change default value useRootNavigator to true

Includes updates to test expectations due to changes in the widget kernel
transformer.

This reverts commit ef2879a4.

Fixes an incorrect cast that caused a build failure.

Landing on red to fix the build.

This adds avoid_dynamic_calls to the list of lints, and fixes all instances where it was violated.

Importantly, this lint is NOT turned on for flutter/packages/test, because those changes are happening in another PR: #84478

* sort directives

* prep for new directives ordering

* update excludes

* - blank

migrate localization to null safety