[jdk21u-dev] RFR: 8315609: Open source few more swing text/html tests

[Sonia Zaldana Calles]

Hi all,

This pull request contains a backport of commit [a04c6c1a](https://github.com/openjdk/jdk/commit/a04c6c1ac663a1eab7d45913940cb6ac0af2c11c) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Prasanta Sadhukhan on 11 Sep 2023 and was reviewed by Jayathirth D V.

Thanks!

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Commit messages:
 - Backport a04c6c1ac663a1eab7d45913940cb6ac0af2c11c

Changes: https://git.openjdk.org/jdk21u-dev/pull/313/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=313&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315609
  Stats: 422 lines in 4 files changed: 422 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/313.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/313/head:pull/313

PR: https://git.openjdk.org/jdk21u-dev/pull/313