RFR: 8350594: Misleading warning about install dir for DMG packaging

[Alexey Semenyuk]

8350594: Misleading warning about install dir for DMG packaging

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Commit messages:
 - Update copyright year
 - Remove redundant import changes
 - Added tests for DMG install dir. Fixed DMG bundler to report warning only when custom install dir differs from the default install dir.

Changes: https://git.openjdk.org/jdk/pull/23752/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23752&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350594
  Stats: 182 lines in 5 files changed: 153 ins; 18 del; 11 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