[jdk25u] RFR: 8370969: --launcher-as-service option is ignored when used with --app-image option

[Alexey Semenyuk]

Clean backport of https://github.com/openjdk/jdk/pull/28071 PR on top of prerequisite commits.

It is easier and safer to bring in all prerequisite commits to get a clean backport than to backport an isolated fix.

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Commit messages:
 - 8370969: --launcher-as-service option is ignored when used with --app-image option
 - 8370956: ShortcutHintTest test fails when executed locally on Linux
 - 8370100: Redundant .png files in Linux app-image cause unnecessary bloat
 - 8343220: Add test cases to AppContentTest jpackage test
 - 8370156: Fix jpackage IconTest
 - 8370442: Compilation error in jpackage EntitlementsTest test
 - 8370122: jpackage test lib improvements
 - 8356578: Test --mac-entitlements
 - 8370126: Improve jpackage signing testing
 - 8370123: Minor jpackage refactoring
 - ... and 19 more: https://git.openjdk.org/jdk25u/compare/89c5659a...be5fdb3f

Changes: https://git.openjdk.org/jdk25u/pull/357/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=357&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370969
  Stats: 15591 lines in 195 files changed: 11827 ins; 2443 del; 1321 mod
  Patch: https://git.openjdk.org/jdk25u/pull/357.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/357/head:pull/357

PR: https://git.openjdk.org/jdk25u/pull/357