In SERVER-87871 we removed all the usages to the upgradeBackCompat and downgradeBackCompat MongoS and MongoD's global parameters. However, binaries still accept the homonymous arguments and these are also shown by the helper (--help argument).

The goal of this ticket is to get rid of these arguments and therefore any occurrences in the code, obtaining the same behavior as the previous version. The 8.0 branch is also affected, so it should be backported.