help.yaml is loaded and parsed repeatedly when using `-h`

[tjprescott]

Follow up from #8500. There was a PR to remove the info statements, but this revealed that each help loader is being processed multiple times (once per command or subgroup) for a single call to help. This should not happen. A call with -h should, at most, load the help.yaml file once per invocation.

[adewaleo]

Thanks for opening an issue for this