internal/civisibility: Add auto test retries telemetry metric

[tonyredondo]

What does this PR do?

This PR adds a new telemetry metric for the auto test retries feature.

v2: #3029

Ticket: SDTEST-1296

Motivation

This metric was missing.

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!

[datadog-datadog-prod-us1]

Datadog Report

Branch report: tony/civisibility-autotestretries-telemetry-metric
Commit report: 9ae9517
Test service: dd-trace-go

✅ 0 Failed, 5108 Passed, 67 Skipped, 2m 27.16s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-12-10 23:29:19

Comparing candidate commit b242866 in PR branch tony/civisibility-autotestretries-telemetry-metric with baseline commit a48a41e in branch main.

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