Match Alert Conditions fields to Discover fields

### Problem Statement

Currently when searching in Discover, the field is called stack.module (issue property outlined[ here](https://docs.sentry.io/concepts/search/searchable-properties/issues/#stackmodule))

The same field is called stacktrace.module when setting an Alert condition see the following:

### Solution Brainstorm

Update the naming schema to match the newer Discover, or add a note when selecting/hovering over field to avoid confusion when creating Alerts.

Related to internal ticket [151408](https://sentry.zendesk.com/agent/tickets/151408)

### Product Area

Alerts

Start by comparing the stack.module label used in Discover with the stacktrace.module label in the Alert condition picker. Trace the relevant Discover and Alerts UI entry points; done when the field naming is consistent or the picker provides a clear explanatory note.

Written by the indexing model from the issue text.