SERVER-104500 has moved the Grid initialization from mongos_main.cpp and mongod_main.cpp to the newly Grid::shutdown() method.

However, both processes have different behaviors in the node shutdown process, so we had to implement both cases under the same method using the isMongos boolean parameter.

This ticket aims to investigate whether it's possible to get rid of the isMongos boolean parameter and execute the same Grid shutdown code on mongoS and mongoD.