This reverts ae0a9cb5 and therefore relands #69629.

Additionally, `flutter update-packages --force-upgrade` has been run to update `pubspec.yaml` to resolve the analyze test failures.

This reverts commit ada6b7e5.

For the ease of code reviews, this only includes minimal code from
MetricPoint, GoogleBenchmarksParser, and their unit tests.

See go/flutter-metrics-center-migration for the overall plan.

* start and stop chromedriver once per sub-shard; do not wait for it to quit

* enable web_long_running_tests but keep them as flaky

Disable null safety auto-detection for the web

Enables build_test for Linux. Currently only flutter_gallery has platform directories for the desktop platforms, so this will run only that build, but this will provide an end-to-end build test for Linux.

Other example/test projects can be brought online for Linux in the future just by adding the linux/ directory to the project.

Currently we only have a test that measures if flutter drive can fail. Unfortunately it has been failing for multiple years based on the fact that the error is due to a missing Gradle config.

Add a smoke success test case, and update both tests to use the test API and the tester-device.

Rolls in several fixes to web tooling, including better handling of absolute file imports. Updates to latest vm service to unblock null safety mode query
Co-authored-by: Gary Roumanis <grouma@google.com>
Co-authored-by: Anna Gringauze <annagrin@google.com>

* update pinned null safety deps

* run update-packages

* add http dep to devicelab package

* rerun update-packages

Enables build_test for Windows. Currently only flutter_gallery has platform directories for the desktop platforms, so this will run only that build, but this will provide an end-to-end build test for Windows.

Other example/test projects can be brought online for Windows in the future just by adding the windows/ directory to the project.

Enables build_test for Windows, macOS, and Linux. Currently only
flutter_gallery has platform directories for the desktop platforms, so
this will run only that build, but this will provide an end-to-end build
test for all three desktop platforms.

Once this lands, other example/test projects can be brought online for
desktop platforms in the future just by adding the relevant platform
directories to the project.

* refactor command running utilities for tests
Co-authored-by: Jonah Williams <jonahwilliams@google.com>

* Fix docset generation.

* Remove checks to be able to test.

* More logging

* More logging

* More logging.

* more logging.

* More logging.

* Add flags to firebase command.

* Re-enable docset generation.

* Disable firebase step.

* Comment docset to speed up validations.

* Re-enable docset.

* Add back condition to prevent uploading docs from PRs.

The train command does nothing and was originally added to provide a no-output default for generating app-jit snapshots. The inject-plugins command is only for a repo-only analysis check, which is not necessary since we regenerate during pub get.

#29805

* adding tests that uses integration_test (e2e) package to flutter

* change the package name for the import

* fix licenses. fix README commands. add links

* adding dependency change auto generated by the tool

* more analyzer error fixes

This converts the packages/flutter/test/services directory to NNBD, now that the services package is converted.

I changed the signature of checkMessageHandler and checkMockMessageHandler on BinaryMessenger to take a nullable handler, since the tests wanted to check to make sure a handler wasn't set, and that functionality no longer works if the handler is non-nullable.