Pre-rendering usability enhancements

Various opportunities to improve the end-user experience of pre-rendering:
- [ ] Improve progress bar tracking for the pre-render phase to be a better reflection of the work that is happening.
- [ ] Improve static analysis detection classification for routes when not going through the pre-render pipeline.
- [ ] Provide some information in the route report about what was pre-rendered.
- [ ] Expose a better public API for manual external control over pre-rendering and static exports.