add %NODEHOST% replacer to allow value actions to populate the --host value associated with the node that generated the session

[mmguero]

Describe the solution you'd like
The value actions allow you to specify %NODE% to get "the name of the capture node," which corresponds to the --node argument passed in to capture. It would be useful to have a replacer (perhaps %NODEHOST% but I don't really care what it's called; %HOST% is already used for something else) that would return the hostname or IP address associated with that capture node: in other words, the --host argument provided to capture.

Describe alternatives you've considered
@awick suggested a redirect service could be used as well.

Additional context
Discussed in the #questions channel with Andy and Elyse on Slack April 2, 2024 at about 9:35 eastern time.