RFR: 8328819: Remove applet usage from JFileChooser tests bug6698013 [v3]

[Alisen Chung]

> Removing applet usage from manual JFileChooser tests
> The original test is failing (nothing shows up in the JFileChooser), but this change does replace the applet usage with PassFailJFrame

Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:

  update test instructions, move vars into subclass

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18456/files
  - new: https://git.openjdk.org/jdk/pull/18456/files/e43d8b1e..5cd07d36

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18456&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18456&range=01-02

  Stats: 14 lines in 1 file changed: 4 ins; 6 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/18456.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18456/head:pull/18456

PR: https://git.openjdk.org/jdk/pull/18456