Migrate IP address inference to `dataCollection.userInfo`

[antonis]

Replace sendDefaultPii checks for IP address handling with dataCollection.userInfo.

Callsites

1. client.ts:63 — infer_ip setting for Relay: options.sendDefaultPii ? 'auto' : 'never'
2. client.ts:85 — addAutoIpAddressToSession listener gated on sendDefaultPii === true

Both should read from the resolved dataCollection.userInfo instead.

References

• packages/core/src/js/client.ts
• packages/core/test/client.test.ts — existing tests for IP address behavior

[linear-code]

RN-580