RFR: 8328484: Convert and Opensource few JFileChooser applet test to main

[Abhishek Kumar]

Few closed manual applet JFileChooser tests convereted to PassFailJFrame based manual test.

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Commit messages:
 - Applet test conerted to main manual and open sourced

Changes: https://git.openjdk.org/jdk/pull/18447/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18447&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328484
  Stats: 442 lines in 3 files changed: 442 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18447.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18447/head:pull/18447

PR: https://git.openjdk.org/jdk/pull/18447