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

This removes the nullOk parameter on the Localizations.localeOf method. This was already changed to have a maybeLocaleOf method, but the nullOk parameter wasn't removed because some third party tests failed. Those have been updated, so this can go in now.

This reverts commit 79d0358e.

Migrate flutter_localizations to null safety.

* Expose date symbols and patterns for en_US in framework

This reverts commit 1de673bc.

* Regenerate _no.arb and _nb.arb from scratch

* Revert no <--> nb synonym logic

* Run encode kn character encoding tool when gen_localizations is run

* Add test that ensures *_kn.arb files are properly encoded/escaped in order to be checked in

* Fix *_no.arb test to not incorrectly pass

Date Picker UI redesign

[a11y] Make sure RenderFractionalTranslation updates its semantics after the translation field is set (#48985)