Consider breaking out build/test summaries

At the beginning of each notification we have a summary of checkout/build/test status. E.g.:

OVERVIEW

        Builds: ❌ FAIL
         Tests: ❌ FAIL

Later in the message we break those down by status. E.g.:

BUILDS

    Status
                 ❌ 83  ✅ 1065

and

TESTS

    Status
        ❌ 23  ✅ 17  ⏩ 32  🚧❌ 1  🚧✅ 1  🚧⏩ 9

However, since we have so many failures, a lot of which are false positives, we should consider duplicating the breakout at the introductory overview as well. I.e.:

OVERVIEW

        Builds: ❌ 83  ✅ 1065
         Tests: ❌ 23  ✅ 17  ⏩ 32  🚧❌ 1  🚧✅ 1  🚧⏩ 9

This would let the readers get a feeling for the results faster.

Suggested by @broonie.