Rageshake should report feature flags

### Steps to reproduce

It doesn’t look like rageshakes report which features a given user is experimenting with? Which surely makes understanding failure modes harder

### Outcome

#### What did you expect?

List of feature flags in rageshakes like we gave for Element Web

### Your phone model

_No response_

### Operating system version

_No response_

### Application version

_No response_

### Homeserver

_No response_

### Will you send logs?

No