[7.13](backport #25854) [Elastic Agent] Fix invalid log level sent to endpoint

[mergify]

This is an automatic backport of pull request #25854 done by Mergify.

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[botelastic]

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[elasticmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Pull request #25991 opened

• Start Time: 2021-05-28T15:05:05.289+0000

• Duration: 51 min 56 sec

• Commit: b414eb4

Test stats 🧪

Test	Results
Failed	0
Passed	6860
Skipped	24
Total	6884

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Test stats 🧪

Test	Results
Failed	0
Passed	6860
Skipped	24
Total	6884

[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/7.13/pr-25854 upstream/mergify/bp/7.13/pr-25854
git merge upstream/7.13
git push upstream mergify/bp/7.13/pr-25854

[jsoriano]

Closing as it seems this change was already backported in #25992, @michalpristas please reopen otherwise. Thanks!