RFR: 8246325: Add DRYRUN facility to SetupExecute

[Erik Joelsson]

On Fri, 5 Sep 2025 15:44:26 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> With `DRYRUN := true`, the actual command line will not be executed, but all other steps are done, to facilitate debugging. 
> 
> This PR has effects on some closed Oracle code, hence the changes in the mac bundle path logic.

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27121#pullrequestreview-3202993327