[jdk21u-dev] RFR: 8328382: Convert java/awt/FileDialog/FileDialogForPackages test to main

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle

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Commit messages:
 - Backport b7a51dd0e8d56a9673b2c802d69019c23d43cb76

Changes: https://git.openjdk.org/jdk21u-dev/pull/2083/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2083&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328382
  Stats: 210 lines in 3 files changed: 79 ins; 131 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2083.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2083/head:pull/2083

PR: https://git.openjdk.org/jdk21u-dev/pull/2083