Fix make clean (#34134)

[AndersonQ]

This is a forwardport of #34134

What does this PR do?

Fixes make clean

Why is it important?

make clean was failing, thus not cleaning the project what might lead to an old build of the beats being used when the elastic-agent package process looks for local beats packages.

Checklist

• My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

How to test this PR locally

Run make clean, it must succeed

Related issues

N/A

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @AndersonQ? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

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

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2022-12-29T07:51:14.542+0000

• Duration: 81 min 52 sec

Test stats 🧪

Test	Results
Failed	0
Passed	25155
Skipped	1954
Total	27109

💚 Flaky test report

Tests succeeded.

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