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

f469f22c1 [in_app_purchase] Only register transactionObservers when someone is listening to purchaseUpdates (flutter/plugins#4035) (#84559)

ab2c00c77 Roll Dart SDK from a38f02400658 to 78fcc3e7aa05 (1 revision) (flutter/engine#26736) (#84537)

7f36f9e02 Roll Dart SDK from ccdd47ff5673 to a38f02400658 (1 revision) (flutter/engine#26735) (#84533)

2bd38de43 Roll Dart SDK from 0a32380de829 to ccdd47ff5673 (1 revision) (flutter/engine#26733) (#84510)