[jdk21u-dev] RFR: 8328398: Convert java/awt/im/4490692/bug4490692.html applet test to main

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle
Either the test works not correctly, or I did not understand.  But behaviour is unchanged.

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Commit messages:
 - Backport 0efd9dc09b969846f79fb8ca16ddf565117d52b6

Changes: https://git.openjdk.org/jdk21u-dev/pull/2047/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2047&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328398
  Stats: 238 lines in 3 files changed: 107 ins; 131 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2047.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2047/head:pull/2047

PR: https://git.openjdk.org/jdk21u-dev/pull/2047