Changing a feature flag `defaultVariant` doesn't dynamically update services while demo is running

[flands]

Bug Report

Which version of the demo you are using? 1.10.0

Symptom

Changing a feature flag defaultVariant while the demo application is running doesn't dynamically update services

What is the expected behavior?

Changing a feature flag defaultVariant to on while demo is running dynamically updates services

What is the actual behavior?

Changing a feature flag defaultVariant to on while demo is running is a noop.

Reproduce

Per https://opentelemetry.io/docs/demo/feature-flags/, To enable a flag, change the defaultVariant value in the config file for a given flag to “on”, while the demo application is running edit src/flagd/demo.flagd.json and change a defaultVariant to on

Additional Context

Perhaps this is expected behavior. If it is, then the documentation should be updated to state that if the demo application is running and a feature flag defaultVariant is changed then you need to restart the flagd service (make restart service=flagd) or restart the demo application for it to take effect.

I can make the documentation change if this is the recommended approach.