[jdk21u-dev] RFR: 8352793: Open source several AWT TextComponent tests - Batch 1

[Satyen Subramaniam]

Backporting JDK-8352793: Open source several AWT TextComponent tests - Batch 1. Adds four AWT TextComponent related tests. Ran GHA Sanity Checks, local Tier 1 and 2, and new tests directly. Patch is clean. Backporting for parity with Oracle.

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Commit messages:
 - Backport f880fa91dce7b8844cfa4e95caa3a982e280165a

Changes: https://git.openjdk.org/jdk21u-dev/pull/2233/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2233&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352793
  Stats: 377 lines in 4 files changed: 377 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2233.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2233/head:pull/2233

PR: https://git.openjdk.org/jdk21u-dev/pull/2233