[8.5](backport #1932) Storing checkin message in last_checkin_message

[mergify]

This is an automatic backport of pull request #1932 done by Mergify.

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[blakerouse]

Wrong backport tag, my bad.

[elasticmachine]

💔 Build Failed

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• Start Time: 2022-09-30T14:07:58.433+0000

• Duration: 3 min 9 sec

Steps errors

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Git fetch

• Took 0 min 2 sec . View more details here
• Description: git fetch https://${GIT_USERNAME}:${GIT_PASSWORD}@github.com/elastic/fleet-server.git +refs/pull/*/head:refs/remotes/origin/pr/* > fetch.log 2>&1

Archive the artifacts

• Took 0 min 1 sec . View more details here
• Description: fetch.log

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