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

7 jobs for !2822 with fix/test-stokes-darcy-l2error in 5 minutes and 37 seconds (queued for 4 seconds)
Child pipeline (parent) latest detached
Status Name Job ID Coverage
  Configure
passed configure #36462

00:00:50

 
  Linting
passed black (python) #36463

00:00:49

passed pylint-flake8 (python) #36464

00:01:13

 
  Select
passed select tests #36465

00:01:59

 
  Build
passed compile cpp #36466

00:01:47

 
  Test
passed test cpp #36467

00:00:58

passed test python #36469

00:00:48