chore: remove all deprecated commands

This change removes all deprecated commands. In many cases, users have been warned for a number of releases before the commands have been removed. All commands that were removed have existing alternatives.

plugins/apps/help-functions

@@ -27,7 +27,6 @@ help_desc
 fn-help-content() {
   declare desc="return help content"
   cat <<help_content
-    apps, [DEPRECATED] Alias for apps:list
     apps:clone <old-app> <new-app>, Clones an app
     apps:create <app>, Create a new app
     apps:destroy <app>, Permanently destroy an app

plugins/apps/subcommands/default

@@ -1,7 +1,6 @@
 #!/usr/bin/env bash
 set -eo pipefail
 [[ $DOKKU_TRACE ]] && set -x
-source "$PLUGIN_AVAILABLE_PATH/apps/internal-functions"
+source "$PLUGIN_AVAILABLE_PATH/apps/help-functions"
 
-dokku_log_warn "Deprecated: Please use apps:list"
-cmd-apps-list "$@"
+cmd-apps-help "apps:help"