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

[Alex Macdonald]

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)

@skarsaune Here's a jira issue you can use for this PR, and then Skara should pick it up and run the CI. It looks like after the change to use the setup-maven action in the workflow ([link](https://github.com/openjdk/jmc/blob/master/.github/workflows/validate.yml#L87)) we cannot run CI in our forks.

For example, the action that tried to run on your fork [here](https://github.com/skarsaune/jmc/actions/runs/10818437740) shows an error:
`stcarolas/setup-maven at v4.5 is not allowed to be used in skarsaune/jmc. Actions in this workflow must be: within a repository owned by skarsaune, created by GitHub, verified in the GitHub Marketplace, or matching the following: openjdk/jmc.`

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PR Comment: https://git.openjdk.org/jmc/pull/588#issuecomment-2353862443