[8.6](backport #33988) Disable lockfile under fleet mode

[mergify]

This is an automatic backport of pull request #33988 done by Mergify.
Cherry-pick of 493b3a4 has failed:

On branch mergify/bp/8.6/pr-33988
Your branch is up to date with 'origin/8.6'.

You are currently cherry-picking commit 493b3a4634.
  (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:   CHANGELOG.next.asciidoc

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   libbeat/cmd/instance/beat.go

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]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[elasticmachine]

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• Start Time: 2022-12-21T18:24:51.818+0000

• Duration: 77 min 26 sec

Test stats 🧪

Test	Results
Failed	0
Passed	25051
Skipped	1951
Total	27002

💚 Flaky test report

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