agent: surface some redirect information for the discovery chain compilation results for the ui

[rboyer]

Currently the HTTP endpoint for accessing the compiled discovery chain fully compiles out some of the data found on the input config entries. This makes re-purposing this endpoint for the UI visualization less than ideal.

One piece of data this is not present at all is the redirect feature from service-resolver entries. These are compiled out like renames. This could in theory have compiled out a redirect of a redirect of a redirect of a .... etc, so figuring out how to surface the whole thing amounts to introducing possibly many more nodes and transitions in the graph which is a much larger change.

One very small change we could make would be somehow indicating on the edges affected by a redirect a small boolean value Redirected.