RFR: 8328384: Convert java/awt/FileDialog/FileDialogOpenDirTest test to main

[Alexander Zuev]

Convert test to main manual;
Move test to appropriate folder;
Delete old files;

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Commit messages:
 - Reorganize imports.
 - 8328384: Convert java/awt/FileDialog/FileDialogOpenDirTest test to main

Changes: https://git.openjdk.org/jdk/pull/18361/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18361&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328384
  Stats: 364 lines in 3 files changed: 82 ins; 282 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18361.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18361/head:pull/18361

PR: https://git.openjdk.org/jdk/pull/18361