[7.17](backport #37592) migrate metricbeat pipeline to Buildkite

[mergify]

This is an automatic backport of pull request #37592 done by Mergify.
Cherry-pick of a611494 has failed:

On branch mergify/bp/7.17/pr-37592
Your branch is up to date with 'origin/7.17'.

You are currently cherry-picking commit a611494eb8.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .buildkite/metricbeat/pipeline.yml
	new file:   .buildkite/scripts/common.sh
	new file:   .buildkite/scripts/crosscompile.sh
	new file:   .buildkite/scripts/generate_metricbeat_pipeline.sh
	new file:   .buildkite/scripts/go_int_tests.sh
	new file:   .buildkite/scripts/install_tools.sh
	new file:   .buildkite/scripts/packaging.sh
	new file:   .buildkite/scripts/py_int_tests.sh
	new file:   .buildkite/scripts/setenv.sh
	new file:   .buildkite/scripts/unit_tests.sh
	new file:   .buildkite/scripts/win_unit_tests.ps1

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both added:      .buildkite/hooks/post-checkout
	deleted by us:   .buildkite/hooks/pre-command

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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