[CI Visibility] CI Test Visibility integration (#2736)

[liashenko]

What does this PR do?

This PR contains merged changes from the stacked PRs (they've been approved):

1. [CI Visibility] Initial internal consts and utilities #2736
2. [CI Visibility] Add support for CI Visibility mode in ddtrace #2739
3. [CI Visibility] Manual Api and Go/Testing integration #2742

All current API are private inside the internal folder. We are planning to use them later by using the orchestrion project to do automatic instrumentation.

Motivation

After this PR we can instrument tests with CI Visibility product.

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: 2024-07-08 13:17:39

Comparing candidate commit 90b5124 in PR branch tony/civisibility-ddtrace with baseline commit 891aad4 in branch main.

Found 3 performance improvements and 2 performance regressions! Performance is the same for 42 metrics, 0 unstable metrics.

scenario:BenchmarkHttpServeTrace-24

• 🟥 execution_time [+392.852ns; +453.548ns] or [+2.372%; +2.738%]

scenario:BenchmarkOTelApiWithCustomTags/datadog_otel_api-24

• 🟥 execution_time [+106.694ns; +141.106ns] or [+2.245%; +2.969%]

scenario:BenchmarkSingleSpanRetention/no-rules-24

• 🟩 execution_time [-8.425µs; -7.984µs] or [-3.382%; -3.206%]

scenario:BenchmarkSingleSpanRetention/with-rules/match-half-24

• 🟩 execution_time [-6.103µs; -4.988µs] or [-2.456%; -2.008%]

scenario:BenchmarkStartSpanConcurrent-24

• 🟩 execution_time [-281.140ns; -130.060ns] or [-4.397%; -2.034%]