feat: port scheduler-docker-local :report subcommand to golang

The bash :report implementation for the scheduler-docker-local plugin is replaced with a compiled golang binary. The plugin already shipped golang code, so the report subcommand is added alongside its existing triggers binary, and the init-process and parallel-schedule-count helpers remain in bash for the deploy pipeline.

plugins/scheduler-docker-local/subcommands/report

@@ -1,6 +0,0 @@
-#!/usr/bin/env bash
-source "$PLUGIN_AVAILABLE_PATH/scheduler-docker-local/internal-functions"
-set -eo pipefail
-[[ $DOKKU_TRACE ]] && set -x
-
-cmd-scheduler-docker-local-report "$@"