[7.17](backport #30781) ci: split windows in mandatory and ext_win stages

[mergify]

This is an automatic backport of pull request #30781 done by Mergify.
Cherry-pick of f0912da has failed:

On branch mergify/bp/7.17/pr-30781
Your branch is up to date with 'origin/7.17'.

You are currently cherry-picking commit f0912dac8b.
  (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:   Jenkinsfile

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   auditbeat/Jenkinsfile.yml
	both modified:   filebeat/Jenkinsfile.yml
	both modified:   heartbeat/Jenkinsfile.yml
	both modified:   metricbeat/Jenkinsfile.yml
	both modified:   packetbeat/Jenkinsfile.yml
	both modified:   winlogbeat/Jenkinsfile.yml
	both modified:   x-pack/auditbeat/Jenkinsfile.yml
	both modified:   x-pack/elastic-agent/Jenkinsfile.yml
	both modified:   x-pack/filebeat/Jenkinsfile.yml
	both modified:   x-pack/functionbeat/Jenkinsfile.yml
	both modified:   x-pack/heartbeat/Jenkinsfile.yml
	both modified:   x-pack/metricbeat/Jenkinsfile.yml
	both modified:   x-pack/osquerybeat/Jenkinsfile.yml
	both modified:   x-pack/packetbeat/Jenkinsfile.yml
	both modified:   x-pack/winlogbeat/Jenkinsfile.yml

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]

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• Start Time: 2022-03-17T08:58:02.778+0000

• Duration: 164 min 28 sec

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Test	Results
Failed	0
Passed	2757
Skipped	315
Total	3072

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[v1v]

I'll close this since 2022 is not supported

[v1v]

/test

[v1v]

/test

[v1v]

/test