test(logging): remove deprecated observeroutput

[kruskall]

Motivation/summary

we're using local loggers now and the observer output is unused and deprecated

solve lint failure on elastic-agent-libs version bump

Checklist

• [ ] Update CHANGELOG.asciidoc
• [ ] Documentation has been updated

For functional changes, consider:

• Is it observable through the addition of either logging or metrics?
• Is its use being published in telemetry to enable product improvement?
• Have system tests been added to avoid regression?

How to test these changes

make test

Related issues

[github-actions[bot]]

:robot: GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[mergify[bot]]

This pull request does not have a backport label. Could you fix it @kruskall? 🙏 To fixup this pull request, you need to add the backport labels for the needed branches, such as:

• backport-7.17 is the label to automatically backport to the 7.17 branch.
• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• backport-9./d is the label to automatically backport to the 9./d branch. /d is the digit.
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[elasticmachine]

:green_heart: Build Succeeded

• Buildkite Build
• Commit: 8df8a2001d21eba0bb279e1381f469f72c03154c

History

• :green_heart: Build #7580 succeeded b59a88823b2bc2c0c21d903f0c0cef53b4d08450
• :green_heart: Build #7568 succeeded 88446af7ac562da0b53b4ca06141e3a1c9aa3954

[github-actions[bot]]

@mergifyio backport 8.19 9.1 9.2

[mergify[bot]]

backport 8.19 9.1 9.2

✅ Backports have been created

• #19881 [8.19] (backport #19693) test(logging): remove deprecated observeroutput has been created for branch 8.19
• #19882 [9.1] (backport #19693) test(logging): remove deprecated observeroutput has been created for branch 9.1
• #19883 [9.2] (backport #19693) test(logging): remove deprecated observeroutput has been created for branch 9.2