RFR: 8343100: Consolidate EmptyFolderTest and EmptyFolderPackageTest jpackage tests into single java file

[Alexey Semenyuk]

- merge EmptyFolderTest, EmptyFolderPackageTest and EmptyFolderTestBase in EmptyFolderTest class.
 - for .msi package still verify the output. It should not contain empty folders from `--input`, but should contain other folders and files.

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Commit messages:
 - 8343100: Consolidate EmptyFolderTest and EmptyFolderPackageTest jpackage tests into single java file

Changes: https://git.openjdk.org/jdk/pull/21721/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21721&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343100
  Stats: 254 lines in 5 files changed: 87 ins; 146 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/21721.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21721/head:pull/21721

PR: https://git.openjdk.org/jdk/pull/21721