Remove `templates/CRM/common/version.tpl`

Background: We aim to allow installing CiviCRM on Drupal 8 via composer/git without requiring the admin to run GenCode.

The file templates/CRM/common/version.tpl is generated by GenCode and then used once... by GenCode. If you grep universe, there's nothing else that references CRM/common/version.tpl.

Task:

Find the place where GenCode relies on templates/CRM/common/version.tpl. Get that information a different way (i.e. read version.xml). Then, update GenCode so that it no longer creates templates/CRM/common/version.tpl.

EDIT: If the file isn't used, then do we really need to remove it? Perhaps we can keep it around (in tarballs) on the off-chance that some unpublished legacy process relies on it, but omit from the D8 builds?

Stepping back... @dsnopek, I'm a little confused -- because it seems to me like this file isn't used, but your D8 install steps copy it over. Did you put that step in as a matter of speculation or based on a concrete issue?