Merge branch 'prepend-letter-v-to-workhorse-version-numbers' into 'master'

Prepend letter v to GitLab Workhorse version numbers

This helps to address gitlab-org/gitlab-ce#12684 so as to maintain consistency in all GitLab projects.

It also addresses: https://gitlab.com/gitlab-org/gitlab-workhorse/issues/4

Next Steps

- create a set of duplicate tags in workhorse to prevent errors when updating from the patch guide


See merge request !3088

doc/update/patch_versions.md

@@ -47,7 +47,7 @@ sudo -u git -H git checkout v`cat /home/git/gitlab/GITLAB_SHELL_VERSION` -b v`ca
 ```bash
 cd /home/git/gitlab-workhorse
 sudo -u git -H git fetch
-sudo -u git -H git checkout `cat /home/git/gitlab/GITLAB_WORKHORSE_VERSION` -b `cat /home/git/gitlab/GITLAB_WORKHORSE_VERSION`
+sudo -u git -H git checkout v`cat /home/git/gitlab/GITLAB_WORKHORSE_VERSION` -b v`cat /home/git/gitlab/GITLAB_WORKHORSE_VERSION`
 sudo -u git -H make
 ```