Tests: add rabbitmq_diagnostics to test helpers (backport #13380) (backport #13426)#13428

michaelklishin merged 1 commit intov4.0.xrabbitmq/rabbitmq-server:v4.0.xfrom

mergify/bp/v4.0.x/pr-13426rabbitmq/rabbitmq-server:mergify/bp/v4.0.x/pr-13426Copy head branch name to clipboard