Codecov flakes on datapointcache.go

[damemi]

exporter/collector/internal/datapointstorage/datapointcache.go regularly causes PR codecov checks to flake as an indirect change. See https://app.codecov.io/gh/GoogleCloudPlatform/opentelemetry-operations-go/pulls

It looks like it is usually an issue with unchecked for loops in the gc function at

opentelemetry-operations-go/exporter/collector/internal/datapointstorage/datapointcache.go

Line 157 in b9b7c0d

func (c *Cache) gc(shutdown <-chan struct{}, tickerCh <-chan time.Time) bool {

Creating this issue to track a fix or reference when approving flaking PRs

[aabmass]

Discussed in triage, it seems like the real issue is the tests are not deterministic/hermetic. Low priority but we would like to get this fixed.

[punya]

Reducing priority because (anecdotally) this hasn't come up much in recent runs.