contrib/log/slog: test with slogtest

[felixge]

What does this PR do?

Use slogtest to ensure that WrapHandler is behaving correctly. This was already the case, so this patch is merely adding additional confidence in the correctness.

Motivation

I didn't know about the slogtest package and just discovered it while looking into something else. So I figured I check if our implementation passes the tests.

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• Add an appropriate team label so this PR gets put in the right place for the release notes.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.
• For internal contributors, a matching PR should be created to the v2-dev branch and reviewed by @DataDog/apm-go.

Unsure? Have a question? Request a review!

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-12-09 16:16:12

Comparing candidate commit e2f9705 in PR branch felix.geisendoerfer/slog-test with baseline commit 7f02289 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 58 metrics, 1 unstable metrics.

[darccio]

Nice one!

[datadog-datadog-prod-us1]

Datadog Report

Branch report: felix.geisendoerfer/slog-test
Commit report: e170541
Test service: dd-trace-go

✅ 0 Failed, 2981 Passed, 24 Skipped, 2m 26.31s Total Time