Support for Cypress Cloud

**Is your feature request related to a problem? Please describe.**

Getting test results from Cypress Cloud is excellent, but if taking advantage of multiple containers, I cannot apparently get aggregated coverage results.

**Describe the solution you'd like**

A way for coverage to be aggregated across container instances.

**Describe alternatives you've considered**

Run locally or use a single container only, but these do not let me take advantage of parallel tests.

**Additional context**
N/A