[jdk25u] RFR: 8358723: jpackage signing issues: the main launcher doesn't have entitlements

[Alexey Semenyuk]

A clean backport of https://github.com/openjdk/jdk/pull/27493 PR. It required backports of a couple of additional patches. Two minor conflicts required resolution. Both straightforward.

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Commit messages:
 - 8368890: open/test/jdk/tools/jpackage/macosx/NameWithSpaceTest.java fails randomly
 - 8358723: jpackage signing issues: the main launcher doesn't have entitlements
 - 8364984: Many jpackage tests are failing on Linux after JDK-8334238
 - 8334238: Enhance AddLShortcutTest jpackage test

Changes: https://git.openjdk.org/jdk25u/pull/250/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=250&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358723
  Stats: 3424 lines in 29 files changed: 2643 ins; 500 del; 281 mod
  Patch: https://git.openjdk.org/jdk25u/pull/250.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/250/head:pull/250

PR: https://git.openjdk.org/jdk25u/pull/250