RFR: 8344587: Reduce number of "jdk.jpackage.internal" classes used from other packages

[Alexander Matveev]

On Tue, 19 Nov 2024 22:31:28 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

> Stop using internal AppImageFile, ApplicationLayout, and PackageFile classes in the tests. Replace them with stubs.
> 
> Stop referencing IOUtils class from XmlUtils and PathUtils classes.

Looks good.

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Marked as reviewed by almatvee (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/22261#pullrequestreview-2447075436