RFR: 8353309: Open source several Swing text tests

[Phil Race]

Open source several Swing text / html related regression tests.

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Commit messages:
 - 8353309

Changes: https://git.openjdk.org/jdk/pull/24364/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24364&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353309
  Stats: 576 lines in 13 files changed: 576 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24364.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24364/head:pull/24364

PR: https://git.openjdk.org/jdk/pull/24364