[jdk21u-dev] RFR: 8359449: [TEST] open/test/jdk/java/io/File/SymLinks.java Refactor extract method for Windows specific test

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

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Commit messages:
 - Backport 49a82d880636a632f4a3471b14b1b1b29ce1d5e6

Changes: https://git.openjdk.org/jdk21u-dev/pull/2217/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2217&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8359449
  Stats: 37 lines in 1 file changed: 20 ins; 15 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2217.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2217/head:pull/2217

PR: https://git.openjdk.org/jdk21u-dev/pull/2217