RFR: 8353661: Open source several swing tests batch5

[Damon Nguyen]

Open-sourcing and standardizing several tests (windows & JSlider)

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Commit messages:
 - Initial opening
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Initial commit for backout

Changes: https://git.openjdk.org/jdk/pull/24671/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24671&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353661
  Stats: 436 lines in 4 files changed: 436 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24671.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24671/head:pull/24671

PR: https://git.openjdk.org/jdk/pull/24671