[ticket/11883] Report completed data step in migration as "Installing Data"

PHPBB3-11883
[ticket/11883] Only output the migration time, not total

PHPBB3-11883
Merge remote-tracking branch 'EXreaction/ticket/11883' into develop

# By Nathan (1) and Nathan Guse (1)
# Via Nathan Guse
* EXreaction/ticket/11883:
  [ticket/11883] Only output the migration time, not total
  [ticket/11883] Report completed data step in migration as "Installing Data"