RFR: 8346669: Increase abstraction in SetupBuildLauncher and remove extra args

[Erik Joelsson]

On Thu, 19 Dec 2024 16:27:30 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> We need to raise the abstraction of the SetupBuildLauncher API, to prepare for static launchers. We should specify the desired outcome, not what flags we should add. This can be seen as the last part of [JDK-8141444](https://bugs.openjdk.org/browse/JDK-8141444) (9 years later).
> 
> In the process, I am removing EXTRA_JAVA_ARGS which has not been used for a long time. I also removed this part from the launcher itself.

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/22832#pullrequestreview-2517575687