[8.9](backport #3046) Add buildkite pipeline to build elastic-agent binary artifacts

[mergify]

This is an automatic backport of pull request #3046 done by Mergify.
Cherry-pick of 30dff79 has failed:

On branch mergify/bp/8.9/pr-3046
Your branch is up to date with 'origin/8.9'.

You are currently cherry-picking commit 30dff79483.
  (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/hooks/pre-command
	modified:   .buildkite/hooks/pre-exit
	new file:   .buildkite/scripts/bootstrap.sh
	deleted:    .buildkite/scripts/integration_tests.sh
	new file:   .buildkite/scripts/steps/build-agent-core.sh
	new file:   .buildkite/scripts/steps/dra-publish.sh
	new file:   .buildkite/scripts/steps/integration_tests.sh
	modified:   Makefile

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   .buildkite/pipeline.elastic-agent-binary-dra.yml
	both modified:   .buildkite/pipeline.yml
	both modified:   catalog-info.yaml

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

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[elasticmachine]

💔 Tests Failed

the below badges are clickable and redirect to their specific view in the CI or DOCS

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Build stats

• Start Time: 2023-07-26T09:50:04.158+0000

• Duration: 25 min 7 sec

Test stats 🧪

Test	Results
Failed	2
Passed	5977
Skipped	23
Total	6002

Test errors

Expand to view the tests failures

Test / Matrix - PLATFORM = 'aws && aarch64 && gobld/diskSizeGb:200' / Test / TestActionDispatcher/Cancel_queued_action – github.com/elastic/elastic-agent/internal/pkg/agent/application/dispatcher

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 Failed 

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 === RUN   TestActionDispatcher/Cancel_queued_action
    dispatcher_test.go:259: PASS:	Handle(string,string,string)
    dispatcher_test.go:260: FAIL:	Save()
        		at: [/var/lib/jenkins/workspace/_agent_elastic-agent-mbp_PR-3129/src/github.com/elastic/elastic-agent/internal/pkg/agent/application/dispatcher/dispatcher_test.go:236]
    dispatcher_test.go:260: FAIL:	DequeueActions()
        		at: [/var/lib/jenkins/workspace/_agent_elastic-agent-mbp_PR-3129/src/github.com/elastic/elastic-agent/internal/pkg/agent/application/dispatcher/dispatcher_test.go:237]
    dispatcher_test.go:260: FAIL: 0 out of 2 expectation(s) were met.
        	The code you are testing needs to make 2 more call(s).
        	at: [/var/lib/jenkins/workspace/_agent_elastic-agent-mbp_PR-3129/src/github.com/elastic/elastic-agent/internal/pkg/agent/application/dispatcher/dispatcher_test.go:260]
    --- FAIL: TestActionDispatcher/Cancel_queued_action (0.00s)
 

Test / Matrix - PLATFORM = 'aws && aarch64 && gobld/diskSizeGb:200' / Test / TestActionDispatcher – github.com/elastic/elastic-agent/internal/pkg/agent/application/dispatcher

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 Failed 

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 === RUN   TestActionDispatcher
--- FAIL: TestActionDispatcher (0.45s)
 

Steps errors

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Go unitTest

• Took 5 min 59 sec . View more details here
• Description: mage unitTest

Checks if running on a Unix-like node

• Took 0 min 0 sec . View more details here
• Description: script returned exit code 1

🐛 Flaky test report

❕ There are test failures but not known flaky tests.

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Genuine test errors

💔 There are test failures but not known flaky tests, most likely a genuine test failure.

• Name: Test / Matrix - PLATFORM = 'aws && aarch64 && gobld/diskSizeGb:200' / Test / TestActionDispatcher/Cancel_queued_action – github.com/elastic/elastic-agent/internal/pkg/agent/application/dispatcher
• Name: Test / Matrix - PLATFORM = 'aws && aarch64 && gobld/diskSizeGb:200' / Test / TestActionDispatcher – github.com/elastic/elastic-agent/internal/pkg/agent/application/dispatcher

🤖 GitHub comments

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

• /test : Re-trigger the build.

• /package : Generate the packages.

• run integration tests : Run the Elastic Agent Integration tests.

• run end-to-end tests : Generate the packages and run the E2E Tests.

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

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	98.684% (75/76)	👍
Files	67.3% (177/263)	👍
Classes	66.802% (328/491)	👍
Methods	53.481% (1014/1896)	👍
Lines	39.317% (11558/29397)	👎 -0.024
Conditionals	100.0% (0/0)	💚

[pchila]

After checking with @jlind23 , we are closing this backport as it should not be needed