RFR: 8341004: Open source AWT FileDialog related tests

[Abhishek Kumar]

AWT File Dialog related tests are converted from applet to automated/manual and moved to open.

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Commit messages:
 - FileDialog tests converted from applet and open sourced

Changes: https://git.openjdk.org/jdk/pull/21316/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21316&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341004
  Stats: 279 lines in 3 files changed: 279 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21316.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21316/head:pull/21316

PR: https://git.openjdk.org/jdk/pull/21316