Combine generative, integration, and unit flags of coverage report

Today, the test coverage for this repo is 82.43%. This is a combined score of unit and acceptance tests.

It is possible to split up this value to better understand the amount of unit tests vs acceptance tests via flags. But, three out of four flags (generative, integration, unit) are really all unit tests. Given that there is likely overlap between these three flags, a combined score is not easily achieved.

To make that report more useful, let's combine the three flags into one.

Acceptance Criteria

• codecov reports only two flags, acceptance and unit