The release_and_deploy function and several proxy plugin scripts call fn-plugin-property-* helpers without sourcing `plugins/common/property-functions`, producing `command not found` errors during deploys. Source the helpers from `plugins/common/functions` and from each proxy plugin entry point that consumes them.
This change ensures users don't have unnecessary proxies starting on their servers and potentially have apps not routing correctly due to another proxy squatting on a port.
Closes#5846