[jdk21u-dev] RFR: 8328378: Convert java/awt/FileDialog/FileDialogForDirectories test to main

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle

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Commit messages:
 - Backport e0373e01fece310d12859207cc5e233f68b7607f

Changes: https://git.openjdk.org/jdk21u-dev/pull/2082/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2082&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328378
  Stats: 219 lines in 3 files changed: 90 ins; 129 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2082.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2082/head:pull/2082

PR: https://git.openjdk.org/jdk21u-dev/pull/2082