RFR: 8307133: Open source some JTable jtreg tests

[Phil Race]

Open source some Swing JTable tests

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Commit messages:
 - 8307133

Changes: https://git.openjdk.org/jdk/pull/13745/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13745&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307133
  Stats: 489 lines in 9 files changed: 489 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13745.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13745/head:pull/13745

PR: https://git.openjdk.org/jdk/pull/13745