Try parallel tests

[koppor]

This PR applies https://docs.gradle.org/8.1/userguide/performance.html#execute_tests_in_parallel to our project.

NOT using the JUNIT parallelism (where we failed a few months ago), but trying gradle :)

More background: https://aahlenst.dev/blog/comparing-parallel-test-execution-in-junit5-gradle-maven/

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1. Change in `CHANGELOG.md` described in a way that is understandable for the average user (if applicable)

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5. [Checked developer's documentation](https://devdocs.jabref.org/): Is the information available and up to date? If not, I outlined it in this pull request.

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6. [Checked documentation](https://docs.jabref.org/): Is the information available and up to date? If not, I created an issue at <https://github.com/JabRef/user-documentation/issues> or, even better, I submitted a pull request to the documentation repository.

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[koppor]

Other PR (#9703) without parallel:

Thus, parallelism doesn't bring anything. Don't know why. Let's investigate if we have more time for this.

[koppor]

[koppor]

[github-actions]

The build for this PR is no longer available. Please visit https://builds.jabref.org/main/ for the latest build.

[koppor]

No speed gain on GitHub, but locally huge performance improvement