Deprecate fields that should not be on payloads according to relay

[adinauer]

Problem Statement

e.g. other on the request is dropped during ingestion.

Solution Brainstorm

other should be deprecated similar to what was done on user (#2258)

There are probably more fields that need to be investigated.

[marandaneto]

@adinauer let's wait for TSC, apparently data is something else, in this case, meant for the request body.

[marandaneto]

Relates to getsentry/team-mobile#56
https://develop.sentry.dev/sdk/event-payloads/types/#request
other has to be deprecated and removed later, there's no replacement.