RFR: 8355578: [java.net] Use @requires tag instead of exiting based on "os.name" property value [v2]

[Volkan Yazici]

> Replaces `os.name` checks in tests with `@requires`. This prevents these tests from being run, and superficial results being generated, on unnecessary platforms.
> 
> Note that `os.name` checks are replaced with `os.family` instead.

Volkan Yazici has updated the pull request incrementally with one additional commit since the last revision:

  Document `@requires` rationale with `@comment`
  
  Co-authored-by: Daniel Fuchs <67001856+dfuch at users.noreply.github.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24997/files
  - new: https://git.openjdk.org/jdk/pull/24997/files/f468738c..242f0787

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24997&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24997&range=00-01

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24997.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24997/head:pull/24997

PR: https://git.openjdk.org/jdk/pull/24997