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f17bad0a - Mark path-based cache entries as stale during install plan (#957)

Mark path-based cache entries as stale during install plan (#957) ## Summary This is a small correctness improvement that ensures that we avoid using stale cache entries for local dependencies in the install plan. We already have some logic like this in the source distribution builder, but it didn't apply in the install plan, and so we'd end up using stale wheels. Specifically, now, if you create a new local wheel, and run `pip sync`, we'll mark the cache entries as stale and make sure we unzip it and install it. (If the wheel is _already_ installed, we won't reinstall it though, which will be a separate change. This is just about reading from the cache, not the environment.)