Attach person and group properties to /flags request

[marandaneto]

Description

Description

Follow up from this discussion here PostHog/posthog-ios#358 (comment)
Example PR on iOS PostHog/posthog-ios#373

• iOS
• Android
• React Native

[marandaneto]

side effect example: https://posthog.slack.com/archives/C06KJQ2RH1A/p1762240188529599