RFR: 8344326: Move jpackage tests from "jdk.jpackage.tests" package to the default package

[Alexey Semenyuk]

Move jpackage tests from "jdk.jpackage.tests" package to the default package.

Remove `WindowsHelper.getTempDirectory()`. It is faulty and found limited use. Updated dependent tests accordingly.

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Commit messages:
 - Rollback excessive change
 - Rollback excessive change
 - Unused commit removed
 - - Move tests from "jdk.jpackage.tests" package to the default package.

Changes: https://git.openjdk.org/jdk/pull/22156/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22156&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344326
  Stats: 81 lines in 21 files changed: 1 ins; 44 del; 36 mod
  Patch: https://git.openjdk.org/jdk/pull/22156.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22156/head:pull/22156

PR: https://git.openjdk.org/jdk/pull/22156