RFR: 8328382: Convert java/awt/FileDialog/FileDialogForPackages test to main [v3]

[Alexander Zuev]

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

Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:

  Got rid of the test window, using OassFailJFrame instead;
  Made all variables local;
  Minor changes based on review comments;

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18360/files
  - new: https://git.openjdk.org/jdk/pull/18360/files/3e84d47a..4a000aee

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18360&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18360&range=01-02

  Stats: 26 lines in 1 file changed: 1 ins; 17 del; 8 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