RFR: 8343221: IOUtils.copyRecursive() doesn't create parent directories

[Alexey Semenyuk]

Fix `FileUtils.copyRecursive()` and add unit tests

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Commit messages:
 - Remove trailing whitespace.
 - 8343221: IOUtils.copyRecursive() doesn't create parent directories

Changes: https://git.openjdk.org/jdk/pull/27405/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27405&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343221
  Stats: 144 lines in 3 files changed: 122 ins; 2 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/27405.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27405/head:pull/27405

PR: https://git.openjdk.org/jdk/pull/27405