[CI] Make debuge-mode tests mandatory again.

Mark and unmark the tests that failed/passed in https://zivgitlab.uni-muenster.de/HPC2SE-Project/pacxx-runtime/-/jobs/10087 as known-to-fail in debug mode.

These tests are known to fail:

• mandel
• rodinia/lavaMD

These tests were perviously known to fail, but pass now:

• AOBench
• matmul

These tests are slow in debug mode and thus excluded from testing in debug mode:

• dot
• saxpy
• voronoi

See: pacxx-runtime#6 (closed)