RFR: 8280965: Tests com/sun/net/httpserver/simpleserver fail with FileSystemException on Windows 11 [v2]

[Julia Boes]

> This change updates the tests in question to handle the case where sym link creation is not supported, as observed on Windows 11 where additional privileges are required to create sym links.
> 
> Testing: tier 1-3 across platforms, plus tests in question on Windows 11 specifically

Julia Boes has updated the pull request incrementally with two additional commits since the last revision:

 - refactor test helper method
 - change jtreg.SkippedException to testng.SkipException

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7335/files
  - new: https://git.openjdk.java.net/jdk/pull/7335/files/24836222..bd9c19d0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7335&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7335&range=00-01

  Stats: 64 lines in 2 files changed: 2 ins; 8 del; 54 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7335.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7335/head:pull/7335

PR: https://git.openjdk.java.net/jdk/pull/7335