RFR: 8350594: Misleading warning about install dir for DMG packaging [v3]

[Alexey Semenyuk]

> - Fix the warning message about the custom installation directory location jpackage issues for DMG runtime packaging.
>  - Don't issue the warning when the `-install-dir` value equals the default installation directory location.
>  - Add relevant tests.

Alexey Semenyuk has updated the pull request incrementally with one additional commit since the last revision:

  Better warning wording

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/23752/files
  - new: https://git.openjdk.org/jdk/pull/23752/files/afc341c4..38b5c346

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23752&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23752&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23752.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23752/head:pull/23752

PR: https://git.openjdk.org/jdk/pull/23752