RFR: 8374216: Assorted changes to jpackage without functional impact [v6]

[Alexander Matveev]

On Tue, 23 Dec 2025 02:27:35 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

>> Miscellaneous refactorings without functional changes:
>> 
>> - Replace StringBuffer with StringBuilder where appropriate
>> - LauncherBuilder: set reasonable defaults to "defaultIconResourceName" property; move `defaultIconResourceName()` from LauncherFromOptions
>> - Make `MacHelper.createRuntimeBundle()` use PackageTest to create a runtime bundle. Will use DMG by default and optionally PKG packaging to create a runtime bundle
>> - Remove redundat parameter from `SetBuilder.build()`
>> - Make `JUnitUtils.assertArrayEquals()` permit null-s
>> - Add `JPackageCommand.withToolProvider()`
>> - Make some handy package-private methods in StandardBundlingOperation class public
>> - BundleSpec: add "sealed" modifier
>> - IdentityWrapper: add `wrapIdentity()`
>> - Simplify `DefaultBundlingEnvironment.createNativePackage()`
>> - TKit: remove "throws IOException" from `createDirectories()`; Replace `TKit.createDirectories()` with `Files.createDirectories()` where directory clean-up is not used
>
> Alexey Semenyuk has updated the pull request incrementally with one additional commit since the last revision:
> 
>   BasicTest: use Files.createDirectories() instead of TKit.createDirectories()

Looks good.

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Marked as reviewed by almatvee (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28957#pullrequestreview-3606368301