RFR: 8261: Use test flag to skip JDP multicast tests in JolokiaTest

[Marcus Hirt]

On Wed, 11 Sep 2024 19:40:23 GMT, Martin Skarsaune <duke at openjdk.org> wrote:

> I just became aware that there is a new flag used to skip JDP tests. 
> I previously added some env checking to skip similar multicast tests for Jolokia. 
> Hence it would be a lot cleaner to use the new standardized mechanism for this.
> Trying out whether this fixes [JMC-8261](https://bugs.openjdk.org/browse/JMC-8261)

Marked as reviewed by hirt (Lead).

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PR Review: https://git.openjdk.org/jmc/pull/588#pullrequestreview-2404674647