RFR: 8370156: Fix jpackage IconTest

[Alexey Semenyuk]

Rework IconTest.

Verified it produces the output as expected.

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Commit messages:
 - Rollback JDK-8370100 specific patch
 - AdditionalLauncher: make getAdditionalLauncherProperties() public; LauncherIconVerifier: make setters unambiguous; Add ConfigurationTarget
 - IconTest: revamp

Changes: https://git.openjdk.org/jdk/pull/27883/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27883&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370156
  Stats: 331 lines in 4 files changed: 179 ins; 68 del; 84 mod
  Patch: https://git.openjdk.org/jdk/pull/27883.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27883/head:pull/27883

PR: https://git.openjdk.org/jdk/pull/27883