RFR: 8328385: Convert java/awt/FileDialog/FileDialogReturnTest test to main [v3]

[Alexander Zuev]

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

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

  Moved test metadate closer to the class definition;
  Made variables local;
  Made test skip execution on an unsupported toolkit;

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18363/files
  - new: https://git.openjdk.org/jdk/pull/18363/files/9c5554f7..132bcbc6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18363&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18363&range=01-02

  Stats: 32 lines in 1 file changed: 16 ins; 15 del; 1 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