Reduce Runtime Metrics frequency to every 10 seconds

[marcotc]

This PR reduces the Runtime Metrics (thread count, global class count, and GC statistics) reporting frequency from every second to every 10 seconds.

Reporting of these values in such fine granularity has a measurable cost, but don't provide enough value to justify the current resolution. Most reporting done across the data collected here span throughout the lifetime of the host application, which can require minutes to hours of data to provide meaningful results.

Additionally, because of the introduction of a new integration tests in this PR, I've also added an Integration Test helper, to allow for easily tagging integration tests and have them only run when appropriate, given their high execution cost.

[ericmustin]

Lgtm, we might be introducing a breaking change to folks metrics dashboard though, as previously i'd assume there was some aggregation occurring that could have changed the value slightly, so we want to document this imo.

[marcotc]

as previously i'd assume there was some aggregation occurring that could have changed the value slightly

I don't expect any material changes, as our dashboard graph resolution is 20 seconds today. Visually in UI graphs, I expect no significant change.

But I agree we should make it clear in the changelog that this change is going out.