[jdk17u-dev] RFR: 8350102: Decouple jpackage test-lib Executor.Result and Executor classes

[Goetz Lindenmaier]

I backport this for parity with 17.0.18-oracle.

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Commit messages:
 - backport 3487f8cbd55b06d332d897a010ae8eb371dd4956

Changes: https://git.openjdk.org/jdk17u-dev/pull/4033/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=4033&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350102
  Stats: 48 lines in 3 files changed: 15 ins; 7 del; 26 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/4033.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/4033/head:pull/4033

PR: https://git.openjdk.org/jdk17u-dev/pull/4033