RFR: 8306432: Open source several AWT Text Component related tests

[Tejesh R]

Open source few AWT Text Component related tests.

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Commit messages:
 - Updated
 - Updated
 - Open sourced TextComponent tests

Changes: https://git.openjdk.org/jdk/pull/13695/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13695&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/jdk/pull/13695.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13695/head:pull/13695

PR: https://git.openjdk.org/jdk/pull/13695