RFR: 8353196: [macos] Contents of ".jpackage.xml" file are wrong when building .pkg from unsigned app image [v2]

[Alexey Semenyuk]

> - Don't create ".jpackage.xml" file in image for DNG or PKG bundles;
>  - Remove ".jpackage.xml" file from unsigned predefined app image for DNG or PKG bundles;
>  - Set the value of `signed` property in ".jpackage.xml" file to "true" only in the app image itself is signed.

Alexey Semenyuk has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Merge branch 'master' into JDK-8353196-full
 - Fix JPackageCommand.macAppImageSigned() and move it together with JPackageCommand.signPredefinedAppImage() to MacHelper class
 - Strip ".jpackage.xml" from copied app image when permitted
 - Don't create app image file on macOS when not needed
 - Adjust JPackageCommand.assertAppImageFile()

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24313/files
  - new: https://git.openjdk.org/jdk/pull/24313/files/b3c387ba..31fff85d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24313&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24313&range=00-01

  Stats: 7391 lines in 112 files changed: 4399 ins; 2620 del; 372 mod
  Patch: https://git.openjdk.org/jdk/pull/24313.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24313/head:pull/24313

PR: https://git.openjdk.org/jdk/pull/24313