Plugins CI has started analyzing+building web packages, however, some web packages use the "example" app as their way to run integration_tests in a browser.

Those tests have already been migrated to null-safety and require a version of integration_test coming from a "future" SDK (more modern that the current 2.0 stable).

Once the new integration_tests from SDK is null-safe, revert this change:

flutter/plugins#3681