Add drone_dimensions to devicelab_build_test. (#115183)
Add drone_dimensions to devicelab_build_test. (#115183)

This is to allow a single drone to manage all the different subbuilds.

Bug: https://github.com/flutter/flutter/issues/114943
flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter