Fix test flake for foregrounding breadcrumb

[twometresteve]

Goal

Fixes a test flake where we expect a breading for foregrounding the app.

Design

The test would flake heavily because it wasn't giving enough time for the foreground notification to arrive and be processed. This change introduces a new command where we can pause the processing of commands for a set period, giving the notifier time to receive and process the notification.

Testing

Covered by CI and I've run it >20 times locally without failing once.

[github-actions]

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