[jdk21u-dev] RFR: 8315952: Open source several Swing JToolbar JTooltip JTree tests

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle.

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Commit messages:
 - Backport d2b2f6759f7b9eb6df8eaa84b88e064c636b24a8

Changes: https://git.openjdk.org/jdk21u-dev/pull/1270/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1270&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315952
  Stats: 262 lines in 5 files changed: 262 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1270.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1270/head:pull/1270

PR: https://git.openjdk.org/jdk21u-dev/pull/1270