[jdk21u-dev] RFR: 8352865: Open source several AWT TextComponent tests - Batch 2

[Satyen Subramaniam]

Backporting JDK-8352865: Open source several AWT TextComponent tests - Batch 2. Adds four text component related tests. Ran GHA Sanity Checks, local Tier 1 and 2, and new tests directly. Patch is clean. Backporting for parity with Oracle.

-------------

Commit messages:
 - Backport 3d0feba00a1c1ef7627880859a093bb00eb8fc4c

Changes: https://git.openjdk.org/jdk21u-dev/pull/2228/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2228&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352865
  Stats: 450 lines in 5 files changed: 450 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2228.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2228/head:pull/2228

PR: https://git.openjdk.org/jdk21u-dev/pull/2228