RFR: JDK-8328299 : Convert DnDFileGroupDescriptor.html applet test to main [v2]

[Harshitha Onkar]

> Following test java/awt/dnd/DnDFileGroupDescriptor/DnDFileGroupDescriptor.html is converted to main using PassFailJFrame.
> 
> This test is currently problem-listed on macOS and linux, but as per the previous JBS bugs [[JDK-6242241](https://bugs.openjdk.org/browse/JDK-6242241), [JDK-8080185](https://bugs.openjdk.org/browse/JDK-8080185), [JDK-7147083](https://bugs.openjdk.org/browse/JDK-7147083)] this test was original created for testing DnD of MS Outlook attachments on Windows system.
> 
> Based on the test history and JBS details, I believe this should be windows-only test and should NOT be problemlisted on macOS and linux as it is **not applicable**.

Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:

  OS check removed

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18335/files
  - new: https://git.openjdk.org/jdk/pull/18335/files/0a7745fe..f586cc64

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18335&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18335&range=00-01

  Stats: 11 lines in 1 file changed: 0 ins; 8 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/18335.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18335/head:pull/18335

PR: https://git.openjdk.org/jdk/pull/18335