RFR: 8353748: Open source several swing tests batch6 [v3]

[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:

  Remove headful tags. Change errors to RE.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24730/files
  - new: https://git.openjdk.org/jdk/pull/24730/files/c7870e3e..52d78abb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24730&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24730&range=01-02

  Stats: 4 lines in 3 files changed: 0 ins; 2 del; 2 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