simplify x-pack/build.gradle

[jsvd]

There is no need to apply rubyUtils.gradle to x-pack/build.gralde, which defined the entire set of tasks from the former into the latter. This can lead to confusing situations like running ./gradlew downloadAndInstallJRuby installing JRuby twice (once in project root and another in x-pack/) since gradle will run all tasks matching that name.

Exhaustive test suite passed: https://buildkite.com/elastic/logstash-exhaustive-tests-pipeline/builds/2803/steps/canvas

[github-actions]

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Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[mergify]

This pull request does not have a backport label. Could you fix it @jsvd? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• If no backport is necessary, please add the backport-skip label

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 1b01828

[donoghuc]

This looks correct to me :)