Unit test arduino dependencies aren't installed prior to unit testing

[ianfixes]

System

• OS: GitLab/Linux
• ruby -v: ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux-gnu]
• bundle -v: Bundler version 1.16.1
• bundle info arduino_ci: Installing arduino_ci 0.2.0
• Arduino IDE version:
• java -version:
• URL of failing CI job: https://gitlab.com/robotics_fun/DC_motors/-/jobs/262638326
• URL of your Arduino project: https://gitlab.com/robotics_fun/DC_motors

Issue Summary

Despite specifying the dependencies in the .arduino-ci.yaml file, they are not installed by the arduino_ci_remote.rb script as part of unit testing -- only as part of compilation testing. This is likely an artifact of when I swapped the order of these 2 operations.