[jdk11u-dev] RFR: 8306432: Open source several AWT Text Component related tests

[Antonio Vieiro]

Clean backport of [JDK-8306432](https://bugs.openjdk.org/browse/JDK-8306432)

Tested on Linux/Gnome and Windows 11. All pass.

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Commit messages:
 - Backport 485a0691f4a762e9673967b7873356fb65afc5bc

Changes: https://git.openjdk.org/jdk11u-dev/pull/2782/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2782&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306432
  Stats: 394 lines in 5 files changed: 394 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2782.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2782/head:pull/2782

PR: https://git.openjdk.org/jdk11u-dev/pull/2782