Add support for Main Computer unit tests on host

.gitlab-ci.yml

CMakeLists.txt

skyward-boardcore

src/boards/MainComputer/Actuators/Actuators.cpp

src/boards/MainComputer/AirBrakes/AirBrakesConfig.h

src/boards/MainComputer/Deployment/DeploymentConfig.h

src/boards/MainComputer/FlightStatsRecorder/FSRConfig.h

src/tests/MainComputer/catch/catch-tests-entry.cpp