Enable 128bit trace ID logging by default

[mtoffl01]

What does this PR do?

Logs contain the full 128bits of the trace id by default. Can be disabled with DD_TRACE_128_BIT_TRACEID_LOGGING_ENABLED=false. Feature applies to tracer logs as well as our supported logger integrations: slog and logrus.

Motivation

Config consistency

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: 2025-02-27 16:44:42

Comparing candidate commit d6017ca in PR branch mtoff/v2-log128bits with baseline commit 73d35e5 in branch v2-dev.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 55 metrics, 1 unstable metrics.

[datadog-datadog-prod-us1]

Datadog Report

Branch report: mtoff/v2-log128bits
Commit report: f59f55e
Test service: dd-trace-go

✅ 0 Failed, 4332 Passed, 65 Skipped, 3m 38.88s Total Time

[hannahkm]

LGTM, but confused why the Orchestrion tests are failing. Maybe @darccio or @RomainMuller would know?