RFR: 8373710: Improve jpackage error reporting [v3]

[Alexander Matveev]

On Tue, 16 Dec 2025 16:59:08 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 test failure; Fix whitespaces

src/jdk.jpackage/macosx/classes/jdk/jpackage/internal/SigningIdentityBuilder.java line 152:

> 150:                 var errMsg = I18N.format("error.cert.not.found", certificateSelector.signingIdentities().getFirst(),
> 151:                         keychain.map(Keychain::name).orElse(""));
> 152:                 Log.error(I18N.format("message.error-header", errMsg));

Looks like it is only place which uses `message.error-header` directly. Do you know why?

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PR Review Comment: https://git.openjdk.org/jdk/pull/28833#discussion_r2624992301