API Endpoint for Inbound data filter

### Problem Statement

API to update/ add errors messages like "ReferenceError: xbrowser is not defined" to the inbound data filters.

### Solution Brainstorm

_No response_

### Product Area

APIs

Start by locating the existing API entry points and inbound data filter implementation in the Sentry repository. Clarify how error messages such as "ReferenceError: xbrowser is not defined" should be added or updated, including the request and response shape. Done means the API behavior and validation are defined and covered by appropriate tests.

Written by the indexing model from the issue text.