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

[Darragh Conway]

Refactor remove the test logic for Windows OS and replace with jtreg check for os

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

Changes: https://git.openjdk.org/jdk/pull/26537/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26537&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/jdk/pull/26537.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26537/head:pull/26537

PR: https://git.openjdk.org/jdk/pull/26537