RFR: 8353504: CDS archives are not found when JVM is in non-variant location

[Ioi Lam]

On Wed, 21 May 2025 15:54:39 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

> Although this fix reverts part of the change for [JDK-8348028](https://bugs.openjdk.org/browse/JDK-8348028), gtestLauncher still works the way it was described in JDK-8348028.
> Also added a test case to test the default CDS archive can be found from a non-variant location.
> 
> Sanity tested tiers 1 and 2.

LGTM.

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Marked as reviewed by iklam (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25361#pullrequestreview-2858729591