RFR: 8353488: Open some JComboBox bugs 3

[Alisen Chung]

Opening some JComboBox bugs

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Commit messages:
 - update jtreg paths
 - opening tests

Changes: https://git.openjdk.org/jdk/pull/24767/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24767&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353488
  Stats: 317 lines in 4 files changed: 317 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24767.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24767/head:pull/24767

PR: https://git.openjdk.org/jdk/pull/24767