RFR: 8328385: Convert java/awt/FileDialog/FileDialogReturnTest test to main

[Alexander Zuev]

Convert test to a main method based;
Move test to an apropriate location;
Remove old files;

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Commit messages:
 - 8328385: Convert java/awt/FileDialog/FileDialogReturnTest test to main

Changes: https://git.openjdk.org/jdk/pull/18363/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18363&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328385
  Stats: 428 lines in 3 files changed: 139 ins; 289 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18363.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18363/head:pull/18363

PR: https://git.openjdk.org/jdk/pull/18363