Remove the obsolete `apps/samples/3DViewer/src/test` directory from the 3DViewer sample, including two test classes that don't run and a set of data files that won't load. This is a follow-on cleanup bug to [JDK-8269259](https://bugs.openjdk.java.net/browse/JDK-8269259).
NOTE: this is targeted to `jfx17`. ------------- Commit messages: - 8271230: Remove obsolete test classes and data files from 3DViewer sample Changes: https://git.openjdk.java.net/jfx/pull/587/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=587&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8271230 Stats: 7167 lines in 16 files changed: 0 ins; 7167 del; 0 mod Patch: https://git.openjdk.java.net/jfx/pull/587.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/587/head:pull/587 PR: https://git.openjdk.java.net/jfx/pull/587
