[jdk21u-dev] RFR: 8328185: Convert java/awt/image/MemoryLeakTest/MemoryLeakTest.java applet test to main

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle

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Commit messages:
 - Backport 4e83f4cfc779e39cca0070b5729a508aeaa74654

Changes: https://git.openjdk.org/jdk21u-dev/pull/1245/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1245&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328185
  Stats: 174 lines in 1 file changed: 41 ins; 94 del; 39 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1245.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1245/head:pull/1245

PR: https://git.openjdk.org/jdk21u-dev/pull/1245