[APIView] Allow creating a permalink to the latest PR revision

The new APIView is great in how it consolidates all APIViews for a package in once place!

For the work I'm doing on ClientModel, it would be great if I could create a URI to share with architects that automatically retrieves the latest revision for either PR-type or manual-type APIViews. This is because I'm working in a feature branch and need architects to review APIs that are not checked into main. I am able to create a permalink to a specific PR revision, but if I share this, there may be new PRs that have gone in since this revision, and architect may not see the latest version without needing to pull down the specific revision from the drop-menu.

@KrzysztofCwalina/@tg-msft FYI

Start by locating the APIView entry points that create permalinks and resolve PR-type and manual-type revisions. Trace how a permalink selects a specific revision, then verify that a new latest-revision link would resolve the newest available revision for both view types.

Written by the indexing model from the issue text.