fix(artifactsPipeline): clean the old sct_runner_ip
fix(artifactsPipeline): clean the old sct_runner_ip

We don't want to use the SCT runner in artifact-tests, but the old
sct_runner_ip file might effect the tests.

This patch changed to clean the old sct_runner_ip file before running
the artifact-tests.

Signed-off-by: Amos Kong <90521e0fa21ff7d99abc04652afcde67a68de6e0@gmail.com>

scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests