Extend conflict detection to alert filters

### Problem Statement

Currently sentry alerts the user when two mutual exclusive conditions to trigger an alert are selected. This detection are not applied to the alerts filters.

### Solution Brainstorm

Add conflicts warnings to filters as well, the example below has two conflicting rule pairs but not error message is shown as in the conditions.


### Product Area

Alerts

Start by tracing the existing conflict detection for alert conditions, then compare how alert filters are represented and validated. Done means the same mutual-exclusion warnings appear for conflicting filter rule pairs, including the example shown.

Written by the indexing model from the issue text.