[jdk21u-dev] RFR: 8353586: Open source several toolkit tests

[Satyen Subramaniam]

Backporting JDK-8353586: Open source several toolkit tests. Adds two toolkit tests - one for window and one for linux systems. Ran GHA Sanity Checks and new tests directly. Patch is clean. Backporting for parity with Oracle.

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Commit messages:
 - Backport 2ba80d2403f749a7d8d4e64139b796737bbb62bf

Changes: https://git.openjdk.org/jdk21u-dev/pull/2293/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2293&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353586
  Stats: 400 lines in 2 files changed: 400 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2293.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2293/head:pull/2293

PR: https://git.openjdk.org/jdk21u-dev/pull/2293