RFR: 8328244: Convert javax/swing/JSlider/6742358/bug6742358.java.java applet test to main

[Abhishek Kumar]

Conversion of manual applet test to main based using PassFailJFrame manual framework

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Commit messages:
 - Applet test converted to main manual

Changes: https://git.openjdk.org/jdk/pull/18321/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18321&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328244
  Stats: 61 lines in 2 files changed: 13 ins; 39 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/18321.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18321/head:pull/18321

PR: https://git.openjdk.org/jdk/pull/18321