Provide better displays for paths when not fully resolved

[DanielRosenwasser]

In #44713, we started to do partial resolutions of paths for auto-import completions. This is great, however, it would be nice if we could do a small amount of work for common cases just to clean up paths that go through node_modules even without further keystrokes.

• In cases where the resolution strategy is node and there are no path mappings, we could try to rewrite some number of dotted segments, followed by node_modules into package_name/... until fully resolved.
• In other cases, we could even just use containingFolderName/filename

Of course, there are risks here since in JS, string math isn't always cheap. In cases where you have hundreds of thousands of auto-imports from node_modules, this could still get expensive.