RFR: 8328185: Convert java/awt/image/MemoryLeakTest/MemoryLeakTest.java applet test to main [v2]

[Damon Nguyen]

> Convert java/awt/image/MemoryLeakTest/MemoryLeakTest.java applet test to main using PassFailJFrame

Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:

  Remove unneeded Global var. Review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18307/files
  - new: https://git.openjdk.org/jdk/pull/18307/files/3c3e5410..fb3d566e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18307&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18307&range=00-01

  Stats: 18 lines in 1 file changed: 1 ins; 7 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/18307.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18307/head:pull/18307

PR: https://git.openjdk.org/jdk/pull/18307