RFR: 8267056: tools/jpackage/share/RuntimePackageTest.java fails with NoSuchFileException

[Alexander Matveev]

For debug build on macOS, runtime which used for test fill be located in /path/jdk-17/fastdebug and /path/jdk-17 will not contain any other files except fastdebug and in this case our check to decide if we need to copy app or runtime will return /path/jdk-17 which is not correct. Fixed by skipping this check for runtime and only using it for app. Also, added ignoring .DS_Store to test which is needed if user used Finder to look inside runtime folder which will cause .DS_Store to be created and will cause test to fail, since this file is not being packaged.

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Commit messages:
 - 8267056: tools/jpackage/share/RuntimePackageTest.java fails with NoSuchFileException

Changes: https://git.openjdk.java.net/jdk/pull/4120/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4120&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267056
  Stats: 15 lines in 2 files changed: 5 ins; 0 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4120.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4120/head:pull/4120

PR: https://git.openjdk.java.net/jdk/pull/4120