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/.gitignore

@@ -1,5 +1,8 @@
 /triggers/*
 /triggers
 /cron-*
+/report
+/report-subcommand
 /scheduler-cron-write
 /scheduler-storage-exec
+/subcommands/report