RFR: 8314810: (fs) java/nio/file/Files/CopyInterference.java should use TestUtil::supportsLinks

[Brian Burkhalter]

Use TestUtil::supportsLinks to suppress testing links, e.g., when running on Windows without elevated privileges.

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Commit messages:
 - 8314810: (fs) java/nio/file/Files/CopyInterference.java should use TestUtil::supportsLinks

Changes: https://git.openjdk.org/jdk/pull/15391/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15391&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314810
  Stats: 18 lines in 1 file changed: 7 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/15391.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15391/head:pull/15391

PR: https://git.openjdk.org/jdk/pull/15391