RFR: 8356107: [java.lang] Use @requires tag instead of exiting based on os.name or separatorChar property [v3]

[Brent Christian]

> For `java.lang` tests, use the `@requires` facility in place of checking the `os.name` system property or `File.separatorChar`.
> 
> Automated test results are omitted as expected.

Brent Christian has updated the pull request incrementally with one additional commit since the last revision:

  apostrophize

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/25163/files
  - new: https://git.openjdk.org/jdk/pull/25163/files/737b222d..5b05ee36

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25163&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25163&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25163.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25163/head:pull/25163

PR: https://git.openjdk.org/jdk/pull/25163