[jdk21u-dev] RFR: 8328384: Convert java/awt/FileDialog/FileDialogOpenDirTest test to main

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle

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Commit messages:
 - Backport 739957ca1e3b9ac9131a68990178e92691744157

Changes: https://git.openjdk.org/jdk21u-dev/pull/2048/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2048&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328384
  Stats: 361 lines in 3 files changed: 79 ins; 282 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2048.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2048/head:pull/2048

PR: https://git.openjdk.org/jdk21u-dev/pull/2048