RFR: 8328378: Convert java/awt/FileDialog/FileDialogForDirectories test to main [v3]

[Alexander Zuev]

> Convert test to main manual and move to the appropriate folder
> Remove old files

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

  Made fd and showBtn variables local.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18358/files
  - new: https://git.openjdk.org/jdk/pull/18358/files/d8f2aa64..63223622

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18358&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18358&range=01-02

  Stats: 6 lines in 1 file changed: 2 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18358.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18358/head:pull/18358

PR: https://git.openjdk.org/jdk/pull/18358