[7.17](backport #35777) Onboard repository in Buildkite

[mergify]

This is an automatic backport of pull request #35777 done by Mergify.

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• @Mergifyio rebase will rebase this PR on its base branch
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[botelastic]

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[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-06-15T13:49:46.271+0000

• Duration: 13 min 24 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3
Skipped	0
Total	3

💚 Flaky test report

Tests succeeded.

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To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• /package : Generate the packages and run the E2E tests.

• /beats-tester : Run the installation tests with beats-tester.

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

[mergify]

This pull request has not been merged yet. Could you please review and merge it @mrodm? 🙏