Add CI Visibility data to client stats (APMSP-1241)

[ajgajg1134]

What does this PR do?

Add the git commit sha if we're generating stats within a CI Visibility context

Motivation

This is added by the agent from span tags so to be consistent here we also need to add it when we calculate stats instead of the agent

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.

Unsure? Have a question? Request a review!

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-11-07 16:59:14

Comparing candidate commit 32ba696 in PR branch andrew.glaude/statsmore with baseline commit bebced4 in branch main.

Found 2 performance improvements and 0 performance regressions! Performance is the same for 57 metrics, 0 unstable metrics.

scenario:BenchmarkSetTagMetric-24

• 🟩 execution_time [-4.632ns; -3.148ns] or [-3.860%; -2.623%]

scenario:BenchmarkSetTagString-24

• 🟩 execution_time [-6.182ns; -3.738ns] or [-5.376%; -3.250%]