[jdk21u-dev] RFR: 8328642: Convert applet test MouseDraggedOutCauseScrollingTest.html to main

[Andrew Lu]

I backport this for parity with 21.0.5-oracle.

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Commit messages:
 - Backport ab183e437c18b445e9c022a4d74de818d4ccecbe

Changes: https://git.openjdk.org/jdk21u-dev/pull/900/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=900&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328642
  Stats: 286 lines in 2 files changed: 48 ins; 211 del; 27 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/900.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/900/head:pull/900

PR: https://git.openjdk.org/jdk21u-dev/pull/900