[8.0](backport #1928) Update main branch

[mergify]

This is an automatic backport of pull request #1928 done by Mergify.
Cherry-pick of 304c97f has failed:

On branch mergify/bp/8.0/pr-1928
Your branch is up to date with 'origin/8.0'.

You are currently cherry-picking commit 304c97f.
  (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:   .ci/Jenkinsfile
	modified:   .ci/build-docker-images.groovy
	modified:   .ci/e2eFleetServer.groovy
	modified:   .ci/e2eKibana.groovy
	modified:   .ci/jobs/build-docker-images.yml
	modified:   .ci/jobs/fleet-server-e2e-tests.yml
	modified:   .ci/jobs/kibana-e2e-tests.yml
	modified:   README.md
	modified:   cli/README.md
	modified:   e2e/README.md

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .ci/jobs/e2e-testing-fleet-daily-mbp.yml
	both modified:   .ci/jobs/e2e-testing-helm-daily-mbp.yml
	both modified:   .ci/jobs/e2e-testing-k8s-autodiscovery-daily-mbp.yml
	both modified:   .ci/jobs/e2e-testing-mbp.yml
	both modified:   .mergify.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: 2021-12-20T11:04:41.306+0000

• Duration: 34 min 38 sec

• Commit: ac7e6a0

Test stats 🧪

Test	Results
Failed	0
Passed	216
Skipped	0
Total	216

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