RFR: 8370100: Redundant .png files in Linux app-image cause unnecessary bloat

[Alexey Semenyuk]

On Wed, 22 Oct 2025 04:36:25 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

> Don't put the default icon (.png) files in the app image on Linux.
> 
> Moving the nested Additional `Launcher.PropertyFile` class at the top level caused most changes in the test code.

@sashamatveev PTAL

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PR Comment: https://git.openjdk.org/jdk/pull/27928#issuecomment-3441021560