RFR: 8315804: Open source several Swing JTabbedPane JTextArea JTextField tests

[Damon Nguyen]

These are the tests being converted:

javax/swing/JTabbedPane/4703690/bug4703690.java
javax/swing/JTabbedPane/GetComponentAt/GetComponentAtTest.java
javax/swing/JTabbedPane/ReplaceCompTab/ReplaceCompTab.java
javax/swing/JTextArea/4849868/bug4849868.java
javax/swing/JTextField/4244613/bug4244613.java

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

Commit messages:
 - Initial commit to add tests to open

Changes: https://git.openjdk.org/jdk/pull/15747/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15747&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315804
  Stats: 512 lines in 5 files changed: 512 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15747.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15747/head:pull/15747

PR: https://git.openjdk.org/jdk/pull/15747