RFR: 8328087: Automate javax/swing/JTable/TAB/TAB.java applet test

[Abhishek Kumar]

Conversion of manual applet test to automated test. CI testing is green. Link attached to JBS.

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Commit messages:
 - Automate applet based test

Changes: https://git.openjdk.org/jdk/pull/18274/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18274&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328087
  Stats: 457 lines in 3 files changed: 245 ins; 212 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18274.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18274/head:pull/18274

PR: https://git.openjdk.org/jdk/pull/18274