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Fixes #3535 and #3332
Summary
Package-linker had a save() phase done after all modules are copied from cache into node_modules.
In there it would create symlinks to topmost dependencies.
Turns out this became obsolete after we started creating symlinks for all nonconflicting packges.
So save() function would sometimes overwrite correct symlinks with the ones taken from deeper dependency tree.
Test plan
Passes test in https://github.com/cmoesel/eslint-8547