[8.10](backport #3380) Fix when fixture.Install logs 'ignoring AGENT_KEEP_INSTALLED...'

[mergify]

This is an automatic backport of pull request #3380 done by Mergify.
Cherry-pick of 3372e6f has failed:

On branch mergify/bp/8.10/pr-3380
Your branch is up to date with 'origin/8.10'.

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	both modified:   pkg/testing/fixture_install.go

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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: 2023-09-26T06:00:46.657+0000

• Duration: 26 min 47 sec

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Test	Results
Failed	0
Passed	6277
Skipped	55
Total	6332

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[mergify]

This pull request has not been merged yet. Could you please review and merge it @AndersonQ? 🙏

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	98.765% (80/81)	👍
Files	67.832% (194/286)	👍
Classes	66.48% (357/537)	👍
Methods	53.112% (1118/2105)	👍
Lines	38.596% (12712/32936)	👍 0.05
Conditionals	100.0% (0/0)	💚

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/8.10/pr-3380 upstream/mergify/bp/8.10/pr-3380
git merge upstream/8.10
git push upstream mergify/bp/8.10/pr-3380

[mergify]

This pull request has not been merged yet. Could you please review and merge it @AndersonQ? 🙏

[pierrehilbert]

@AndersonQ could you please take care of it?

[mergify]

This pull request has not been merged yet. Could you please review and merge it @AndersonQ? 🙏