WIP: rules: Add "steam" symlink to the stub steam-runtime-steam-remote
"steam-runtime-steam-remote" is an executable that tries to pass the given commands directly to the running Steam client.
When we are in a container "steam" is not expected to be in the PATH. This symlink allows games that launches steam commands, e.g. "steam steam://nav/downloads", to work as they expected.
This depends on steam-runtime-tools!280 (merged)
After the merge it needs to be cherry-picked for Soldier and Sniper too.