fix: properly initiate logger

[rubvs]

Motivation/summary

Fix panic when benchmarking

[2025-05-08T12:21:20Z] panic: runtime error: invalid memory address or nil pointer dereference
[2025-05-08T12:21:20Z] [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xeb3d57]
[2025-05-08T12:21:20Z] 
[2025-05-08T12:21:20Z] goroutine 50 [running]:
[2025-05-08T12:21:20Z] github.com/elastic/elastic-agent-libs/logp.(*Logger).Named(0xc0001799c0?, {0x192d7d0?, 0x251f680?})
[2025-05-08T12:21:20Z] 	/var/lib/buildkite-agent/go/pkg/mod/github.com/elastic/elastic-agent-libs@v0.19.4/logp/logger.go:150 +0x17
[2025-05-08T12:21:20Z] github.com/elastic/beats/v7/libbeat/idxmgmt.DefaultSupport.MakeDefaultSupport.func1(...)
[2025-05-08T12:21:20Z] 	/var/lib/buildkite-agent/go/pkg/mod/github.com/elastic/beats/v7@v7.0.0-alpha2.0.20250505142450-af0a5dad0d45/libbeat/idxmgmt/idxmgmt.go:109
[2025-05-08T12:21:20Z] github.com/elastic/beats/v7/libbeat/idxmgmt.DefaultSupport({{0x0, 0x0}, {0x0, 0x0}, {0x0, 0x0}, 0x0, {0x0, 0x0}, {0x0, ...}, ...}, ...)
[2025-05-08T12:21:20Z] 	/var/lib/buildkite-agent/go/pkg/mod/github.com/elastic/beats/v7@v7.0.0-alpha2.0.20250505142450-af0a5dad0d45/libbeat/idxmgmt/idxmgmt.go:97 +0x65
[2025-05-08T12:21:20Z] github.com/elastic/apm-server/internal/publish_test.BenchmarkPublisher(0xc0001682c8)
[2025-05-08T12:21:20Z] 	/var/lib/buildkite-agent/.buildkite-agent/builds/worker-1799330-build-hel1-dc1-hetzner-elasticnet-co/elastic/apm-agent-microbenchmark/apm-server-4e83d2cbd08ddc195f485b48aa8862d774a12fa5/internal/publish/pub_test.go:143 +0x15a
[2025-05-08T12:21:20Z] testing.(*B).runN(0xc0001682c8, 0x1)
[2025-05-08T12:21:20Z] 	/var/lib/buildkite-agent/.gvm/versions/go1.24.2.linux.amd64/src/testing/benchmark.go:219 +0x190
[2025-05-08T12:21:20Z] testing.(*B).run1.func1()
[2025-05-08T12:21:20Z] 	/var/lib/buildkite-agent/.gvm/versions/go1.24.2.linux.amd64/src/testing/benchmark.go:245 +0x48
[2025-05-08T12:21:20Z] created by testing.(*B).run1 in goroutine 1
[2025-05-08T12:21:20Z] 	/var/lib/buildkite-agent/.gvm/versions/go1.24.2.linux.amd64/src/testing/benchmark.go:238 +0x90
[2025-05-08T12:21:20Z] exit status 2
[2025-05-08T12:21:20Z] FAIL	github.com/elastic/apm-server/internal/publish

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 bench

Related issues

[github-actions]

🤖 GitHub comments

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

[mergify]

This pull request does not have a backport label. Could you fix it @rubvs? 🙏
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.