[jdk21u-dev] RFR: 8327838: Convert java/awt/FileDialog/MultipleMode/MultipleMode.html applet test to main

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle

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

Commit messages:
 - Backport 30249c4cca51dccd24d5f8f58c7a34c27948a295

Changes: https://git.openjdk.org/jdk21u-dev/pull/2003/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2003&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327838
  Stats: 438 lines in 3 files changed: 106 ins; 332 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2003.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2003/head:pull/2003

PR: https://git.openjdk.org/jdk21u-dev/pull/2003