If a GitHub checks contains more than 50 annotations, then the
check is split into several calls. This fix makes sure that all
additional calls will not only copy the properties `title` and
`summary` but also the previously missing property `text`.
This change adds or update a swath of tests to push method code coverage numbers up.
Yes, method coverage is not super meaningful, but it is one metric that we can use to
ensure at least minimal coverage of this library.
Almost no product changes in here.