Posthog client sending 'true' on 'sendFeatureFlagEvent'

[pauld-doorloop]

When sending 'sendFeatureFlagEvent' as false in clientOptions, calling 'getFeatureFlag' doesn't respect the client options but simply overrides it with sending true, for sending the 'feature flag called' event.

Recommend adding this in the constructor:

      this.sendFeatureFlagEvent = options.posthogConfiguration?.clientOptions?.sendFeatureFlagEvent ?? true