RFR: 8333569: jpackage tests must run app launchers with retries on Linux only

[Alexander Matveev]

On Wed, 5 Feb 2025 03:34:59 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

> Run app launchers in jpackage tests with retries on Linux only. Run them without retries on other platforms.
> 
> Supplementary remove `HelloApp.AppOutputVerifier.removePathEnvVar()` function. It sets an unused member field and is a leftover from [JDK-8347300](https://bugs.openjdk.org/browse/JDK-8347300) fix. This change has no functional impact; it cleans unused code.

Looks good.

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Marked as reviewed by almatvee (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23454#pullrequestreview-2597127677