Remove hard link code and SameFile function

[gsoltis]

Removes code for hard links, which wasn't being used. Removes CopyOrLinkFile, which means symlink handling needs to be pushed down to CopyFile, so CopyFile now handles symlinks (broken or otherwise). Caching behavior is unchanged from the base branch (See #1453).

Also removes SameFile, which is no longer necessary now that we don't expect to be dealing with hard links. The calls in tests have been replaced with helpers that check file contents and file mode.

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