[jdk21u-dev] RFR: 8328648: Remove applet usage from JFileChooser tests bug4150029

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle.

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

Commit messages:
 - Backport 021ed6aea92f770ebeae65175d94797f7c418c82

Changes: https://git.openjdk.org/jdk21u-dev/pull/1477/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1477&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328648
  Stats: 150 lines in 2 files changed: 55 ins; 54 del; 41 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1477.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1477/head:pull/1477

PR: https://git.openjdk.org/jdk21u-dev/pull/1477