[jdk21u-dev] RFR: 8360408: [TEST] Use @requires tag instead of exiting based on "os.name" property value for sun/net/www/protocol/file/FileURLTest.java

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

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Commit messages:
 - Backport d4705947d89509b235cf48328014331c9c6cee80

Changes: https://git.openjdk.org/jdk21u-dev/pull/2247/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2247&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8360408
  Stats: 6 lines in 1 file changed: 1 ins; 4 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2247.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2247/head:pull/2247

PR: https://git.openjdk.org/jdk21u-dev/pull/2247