Introduce a configurable directory for 3rd party plugins that's not deleted during the Mnesia => Khepri migration (backport #14622)#14625

michaelklishin merged 2 commits intov4.2.xrabbitmq/rabbitmq-server:v4.2.xfrom

mergify/bp/v4.2.x/pr-14622rabbitmq/rabbitmq-server:mergify/bp/v4.2.x/pr-14622Copy head branch name to clipboard