[test][md] Use new error helper in convergence test

7 jobs for !2822 with fix/test-stokes-darcy-l2error in 5 minutes and 23 seconds (queued for 3 seconds)
Child pipeline (parent) latest detached
Status Name Job ID Coverage
  Configure
passed configure #36472

00:00:34

 
  Linting
passed black (python) #36475

00:01:07

passed pylint-flake8 (python) #36477

00:01:02

 
  Select
passed select tests #36481

00:03:08

 
  Build
passed compile cpp #36484

00:01:28

 
  Test
passed test cpp #36487

00:00:11

passed test python #36489

00:00:26