RFR: 8328382: Convert java/awt/FileDialog/FileDialogForPackages test to main

[Alexander Zuev]

Convert test to a main based;
Move test to an appropriate folder;
Remove old files;

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Commit messages:
 - Reorganize imports.
 - 8328382: Convert java/awt/FileDialog/FileDialogForPackages test to main

Changes: https://git.openjdk.org/jdk/pull/18360/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18360&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328382
  Stats: 224 lines in 3 files changed: 93 ins; 131 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18360.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18360/head:pull/18360

PR: https://git.openjdk.org/jdk/pull/18360