[jdk19] RFR: 8289030: [macos] app image signature invalid when creating DMG or PKG [v3]

[Alexander Matveev]

> Fixed 3 issues which made signature invalid:
> - We should not remove .jpackage.xml from signed app image when creating DMG or PKG otherwise it invalidates signature.
> - .package should be created when app image is generated, so this file can be signed.
> - Copying predefine app image for DMG and PKG should not follow symbolic links, otherwise several files from runtime (COPYRIGHT and LICENSE) will be copied instead of symbolic links being created, since it invalidates signature as well.
> 
> Added additional test to validate signature when DMG or PKG is generated from predefined app image.

Alexander Matveev has updated the pull request incrementally with one additional commit since the last revision:

  8289030: [macos] app image signature invalid when creating DMG or PKG [v3]

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Changes:
  - all: https://git.openjdk.org/jdk19/pull/89/files
  - new: https://git.openjdk.org/jdk19/pull/89/files/4d5d4bce..a84c725d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk19&pr=89&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk19&pr=89&range=01-02

  Stats: 37 lines in 7 files changed: 15 ins; 14 del; 8 mod
  Patch: https://git.openjdk.org/jdk19/pull/89.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/89/head:pull/89

PR: https://git.openjdk.org/jdk19/pull/89