remove unused scripts

[sharbuz]

What is the problem this PR solves?

Jenkins->Buildkite pipelines migration

remove unused scripts

Related issues

https://github.com/elastic/ingest-dev/issues/1693

[botelastic[bot]]

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[elasticmachine]

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• Duration: 12 min 29 sec

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[mergify[bot]]

This pull request is now in conflicts. Could you fix it? 🙏 To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b cleanup-beats upstream/cleanup-beats
git merge upstream/main
git push upstream cleanup-beats

[dliappis]

Superseded by https://github.com/elastic/beats/pull/39464 (additional PRs will follow to match the clean ups done in this PR)