RFR: 8353748: Open source several swing tests batch6 [v2]

[Damon Nguyen]

> Open-sourcing and standardizing several swing tests (JTree)

Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:

  Add headful tags

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24730/files
  - new: https://git.openjdk.org/jdk/pull/24730/files/5bb73d48..c7870e3e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24730&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24730&range=00-01

  Stats: 2 lines in 2 files changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24730.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24730/head:pull/24730

PR: https://git.openjdk.org/jdk/pull/24730