Pre-rendering usability enhancements

[james-elicx]

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.