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

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`.