Fix forgotten 'delete' calls at the end of some tests

Context

Fix simple direct leaks mentioned in aidge#196 (closed) where delete call was forgotten

added Fix 🔥🔥 label

assigned to @pineapple

changed target branch from main to fix

changed the description

added 1 commit

• 88826884 - [TMP] change scheduler test for Merge to be possible

Compare with previous version

changed milestone to %aidge_backend_cpu v0.3.1

mentioned in task aidge#196 (closed)

mentioned in commit c6edaf36

merged

mentioned in merge request !98 (merged)