refactor: use a single method for running the ps:*all commands

This reduces the duplication at the cost of slightly more complexity.

plugins/ps/subcommands/stopall

@@ -2,38 +2,13 @@
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
-source "$PLUGIN_AVAILABLE_PATH/config/functions"
-source "$PLUGIN_AVAILABLE_PATH/ps/functions"
+source "$PLUGIN_AVAILABLE_PATH/ps/internal-functions"
 
 ps_stopall_cmd() {
   declare desc="stops all apps via command line"
   local cmd="ps:stopall"
-  local GNU_PARALLEL
 
-  if which parallel >/dev/null 2>&1; then
-    dokku_log_info1 "Stopping in parallel"
-    GNU_PARALLEL=$(parallel -V 2>&1 | grep GNU || true)
-    if [[ -z "$GNU_PARALLEL" ]]; then
-      # shellcheck disable=SC2046
-      parallel -i bash -c "dokku ps:stop {}" -- $(dokku_apps)
-    else
-      dokku_apps | parallel 'dokku ps:stop {}'
-    fi
-    return
-  fi
-
-  for app in $(dokku_apps); do
-    if ! (is_deployed "$app"); then
-      dokku_log_warn "App $app has not been deployed"
-      continue
-    fi
-
-    dokku_log_verbose "Stopping app $app ..."
-    if ps_stop "$app"; then
-      continue
-    fi
-    dokku_log_warn "dokku ps:stop ${app} failed"
-  done
+  fn-ps-parallel-cmd "stop"
 }
 
 ps_stopall_cmd "$@"