Fix assert due to VSCode passing in an isolateId as well as the expected args to setPubRootDirectories. (#68721)

* Fix null safety error in inspector service extensions taking variable numbers of args.

Fixes https://github.com/flutter/flutter/issues/68627.
Also fix all inspector tests that do not rely on golden image functionality
so that they run with --enable-experiment=non-nullable. This verifies there
is test coverage to ensure there isn't a regression.

* Remove uses of dynamic.

* add language version 2.8 in packages/flutter

* enable non-nullable analyzer flag

This reverts commit f0174b17.

* Revert "Revert "Send text error in JSON and print in tools (#58284)" (#58872)"

This reverts commit c2d5e18c.

* Put streamListen in try/catch if extension events already listened for

This reverts commit cce6b3c5.

* Send text error in JSON and print in tools

* Add test for error text

* Fix analysis issues

* Move streamListen to try/catch and use global.printStatus

* Extract print error fn and listen for events in web runner

* Add extension listen request to test

* Update packages/flutter_tools/lib/src/resident_runner.dart
Co-authored-by: Jonah Williams <jonahwilliams@google.com>

* Rename error parsing method

* Allow crash if listen for extension stream fails

* Add test for error and non-error extension events

* Fix formatting for TextTreeRenderer

* Use shorter message for second exceptions

* Specify types for map

* Add empty JSON for resident_web_runner test

* Move stream listen to vmservice and add vmservice test

* Fix stream type

* Move structured error log definition to vmservice

* Use correct test matcher isNot
Co-authored-by: Jonah Williams <jonahwilliams@google.com>

* Add function to set structured error early

* Remove unused imports

* Save test handler in setUp

* Add utils file for shared test service

* Rename structured error functions

* Use setUpAll to save error handler and call initStructuredError from other init

* Rename widget inspector test service

* Remove debugging print statement

* Move error handling setting back to initServiceExtensions

* Rename structured error handler in test

* Namespace environment variable

* Rename test

This reverts commit d35671c6.

* Fix FlutterError.onError in debug mode

* update

* fix comments

* add license header

* fix analyzer

* update

* another attempt

* fix test

* fix comment

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

* add key to constructors of public widgets

* fix a test

* fix a test

* implicit-casts:false in flutter/lib/src/widgets

* address review comments

* address review comment

* Update project.pbxproj files to say Flutter rather than Chromium

Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.

* Update the copyright notice checker to require a standard notice on all files

* Update copyrights on Dart files. (This was a mechanical commit.)

* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.

Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).

* Clean up the copyrights in non-Dart files. (Manual edits.)

Also, make sure templates don't have copyrights.

* Fix some more ORGANIZATIONNAMEs

* Add additional properties callback in Inspector Serialization Delegate

* Rename _SerializationDelegate to InspectorSerializationDelegate and add test

* Fix indentation

* Remove trailing whitespace

* Handle case when addAdditionalPropertiesCallback returns null

* Improve docs and minor renames

* Improve docs

* Improve documentation

This reverts commit 8df0d655.

* Make inspector details subtree depth configurable.