RFR: 8373710: Improve jpackage error reporting [v5]

[Alexander Matveev]

On Wed, 17 Dec 2025 23:41:20 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

>> - Append "Error: " prefix to error messages
>> - Always print stack traces of internal exceptions, not only when running in verbose mode
>
> Alexey Semenyuk has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix merge

Marked as reviewed by almatvee (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28833#pullrequestreview-3590137159