chore: rename reportHealthMetrics function

[mtoffl01]

What does this PR do?

Renames the reportHealthMetrics function to reportHealthMetricsAtInterval

Motivation

Health metrics are reported across the repo; the name reportHealthMetrics can be confusing and incorrectly imply that the only health metrics we report are done inside of this function.

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: mtoff/refactor-report-health-metrics
Commit report: 3995717
Test service: dd-trace-go

✅ 0 Failed, 5117 Passed, 70 Skipped, 2m 54.54s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-12-23 16:29:52

Comparing candidate commit c7a40e5 in PR branch mtoff/refactor-report-health-metrics with baseline commit d393324 in branch main.

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

[hannahkm]

Smallest nit in the world: since we are clarifying that not all health metrics are contained in this function, should we also be clear about that in this comment? Something along the lines of:

Suggested change

	// reportHealthMetricsAtInterval reports health metrics at the specified interval to reduce noise.
	// reportHealthMetricsAtInterval reports certain/noisy health metrics at the specified interval to reduce noise.

I'm not sure what word will best describe these metrics, but dealer's choice 👍🏼