Mac tool_integration_tests_4_4 is prone to timing out #152397
Description
Example 1: https://ci.chromium.org/ui/p/flutter/builders/try/Mac%20tool_integration_tests_4_4/38137/overview
Example 2: #152386 (comment)
Assuming all the tests running here are valuable, we probably should further shard this.