[jdk17u-dev] RFR: 8341378: Open source few TrayIcon tests - Set8

[Goetz Lindenmaier]

I backport this for parity with 17.0.16-oracle.

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Commit messages:
 - Backport b9db74a64577bf2b79570a789c91de6549a50788

Changes: https://git.openjdk.org/jdk17u-dev/pull/3430/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3430&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341378
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3430.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3430/head:pull/3430

PR: https://git.openjdk.org/jdk17u-dev/pull/3430