Convert `StreamLinesTest` to JUnit and remove dependency on TestNG test infrastructure, including `OpTestCase`. The test now uses standard JUnit assertions and no longer depends on testlibrary stream helpers.
------------- Commit messages: - Remove redundant declarations - Update copyright year from 2017 to 2026 - Refactor StreamLinesTest to remove dependency on OpTestCase - 8379818: Refactor java/nio/file/Files/StreamLinesTest.java to use JUnit Changes: https://git.openjdk.org/jdk/pull/30302/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=30302&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8379818 Stats: 46 lines in 1 file changed: 10 ins; 17 del; 19 mod Patch: https://git.openjdk.org/jdk/pull/30302.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/30302/head:pull/30302 PR: https://git.openjdk.org/jdk/pull/30302
