SDK with feature flag poller enabled has data races: ``` go test -race -v . ``` There seem two be a couple of offenders: 1. `poller.fetchedFlagsSuccessfullyOnce` ([this](https://github.com/posthog/posthog-go/blob/fbd687c18571c61fa6b78e63b52bff8d9ce80063/featureflags.go#L641) and [this](https://github.com/posthog/posthog-go/blob/fbd687c18571c61fa6b78e63b52bff8d9ce80063/featureflags.go#L179)) 2. `poller.featureFlags` and everywhere where they are read with `poller.GetFeatureFlags()` Full log: [test.log](https://github.com/PostHog/posthog-go/files/14141250/test.log)
