RFR: 8354214: Open source Swing tests Batch 2 [v3]

[Jayathirth D V]

> Few swing JList tests are open sourced.

Jayathirth D V has updated the pull request incrementally with one additional commit since the last revision:

  Update after review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24588/files
  - new: https://git.openjdk.org/jdk/pull/24588/files/93791b9a..b0ac7140

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24588&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24588&range=01-02

  Stats: 39 lines in 3 files changed: 15 ins; 15 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/24588.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24588/head:pull/24588

PR: https://git.openjdk.org/jdk/pull/24588