RFR: 8343101: Rework BasicTest.testTemp test cases

[Alexey Semenyuk]

Make `BasicTest.testTemp()` test cases run jpackage with non-empty `--temp` directory only once instead of twice.
Add additional checks jpackage doesn't change contents of `--temp` directory if it aborts execution.

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Commit messages:
 - 8343101: Rework BasicTest.testTemp test cases

Changes: https://git.openjdk.org/jdk/pull/21720/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21720&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343101
  Stats: 67 lines in 2 files changed: 34 ins; 17 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/21720.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21720/head:pull/21720

PR: https://git.openjdk.org/jdk/pull/21720