Use `WGET_OPTIONS` to provide custom UA so that wget jtreg works for github-action CI.
Test: GHA fails consistently before and passes with this patch --------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - GHA: Use a non-wget user agent when building jtreg Changes: https://git.openjdk.org/jdk/pull/33809/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=33809&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8397020 Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/33809.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/33809/head:pull/33809 PR: https://git.openjdk.org/jdk/pull/33809
