RFR: 8373710: Improve jpackage error reporting

[Alexey Semenyuk]

- Append "Error: " prefix to error messages
- Always print stack traces of internal exceptions, not only when running in verbose mode

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Commit messages:
 - Improve error reporting: fix the value of "message.error-header" l10n key that was supposed to be updated in JDK-8372359. Always print stack trace of an exception if was not explicitly thrown from jpackage code. Better test coverage for the cli/Main.

Changes: https://git.openjdk.org/jdk/pull/28833/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28833&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373710
  Stats: 229 lines in 3 files changed: 220 ins; 1 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/28833.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28833/head:pull/28833

PR: https://git.openjdk.org/jdk/pull/28833