In `java.io.WinNTFileSystem::isInvalid`, replace an insufficient test for file path validity with a sufficient test for file path invalidity. Also, add a new test.
------------- Commit messages: - 8354450: Using a File with a path containing a trailing space should fail when alternative data streams are disabled (win) Changes: https://git.openjdk.org/jdk/pull/24635/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24635&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8354450 Stats: 89 lines in 2 files changed: 82 ins; 3 del; 4 mod Patch: https://git.openjdk.org/jdk/pull/24635.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/24635/head:pull/24635 PR: https://git.openjdk.org/jdk/pull/24635
