Clean and restructure counter tests for a coverage object

For tests produced with options(covr.record_tests), prune any unused records in the $tests$tally matrices of each trace and get rid of the wrapping $tests environment (reassigning with value of $tests$tally)

as_coverage_with_tests(counters)

Arguments

counters

An environment of covr trace results to convert to a coverage object. If counters is not provided, the covr namespace value .counters is used.