Make runfiles tree creation on Windows depend on the artifacts of the actual runfiles.

This is necessary because the plan for Windows calls for knowing if the target of the symlink is a directory or a file, thus, we cannot create runfiles trees before the artifacts in them are built. This probably comes with a performance hit due to the extra scheduling constraints.

This makes almost every test pass save:

- test_tmpdir in bazel_test_test, which I hereby dismiss as a fluke
- test_http_archive_tgz in external_integration_test (Maybe a permissions issue due to copying things?)
- A bunch of test in external_correctness_test, probably related to the fact that since we are copying things, we don't notice changes to the original files.

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MOS_MIGRATED_REVID=113050025

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