test.py: fix log handling on error for Python and CQL tests
test.py: fix log handling on error for Python and CQL tests

Fix mixing of log filename and log summary in error reporting for
CQLApprovalTest and PythonTest.

Signed-off-by: Alejo Sanchez <alejo.sanchez@scylladb.com>

Closes #11125

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla