scm: mercurial: split Repository::Mercurial#latest_changesets_cond for short and long id (#14361)

git-svn-id: http://svn.redmine.org/redmine/trunk@12751 e93f8b46-1217-0410-a6f0-8f06a7374b81
scm: mercurial: use long id in adapter level (#14361)

git-svn-id: http://svn.redmine.org/redmine/trunk@12752 e93f8b46-1217-0410-a6f0-8f06a7374b81