Switch to just using paths as keys for file watching #74877
Merged
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This simplifies work happening in #74780
In that PR we want to be able to make things like AnalyzerFileReferences temporarily, but switch out with IsolatedReferences to get dedicated ALCs. If we use the analyzer ref itself as a key, this becomes much more complicated. However, if all we're using is the path anyways (for both listening to notifications, and for reporting them externally), then it's simpler to just base the API on that.