CI: Do not fail the entire pipeline if there are LSAN logs

Even in a successful LibWeb test run, on Linux, we currently always have
LSAN output. Causing this step to fail is currently making every run of
CI fail.

If LibWeb tests did fail, they should exit with a non-zero status code
on their own, causing the pipeline to fail.

.github/workflows/lagom-template.yml

@@ -208,7 +208,6 @@ jobs:
           else
             echo "$log_output"
             echo "Sanitizer errors happened while running tests; see the Test step above."
-            exit 1
           fi
 
       - name: Lints