The native test job ran every test_* suite in a single platformio invocation,
so a failure in the growing suite set could land past the viewable log limit.
Build the test programs once, then run the suites grouped by area in sequential
invocations, each with its own JUnit report and collapsible log. The runs share
one build dir, so gcov coverage still accumulates and a single capture holds the
union. Areas are ordered regex rules with a catch-all, so a new suite always runs.
Thomas Göttgens
4906f8a6d9
