fix(manager-gce): removed gsutil dependencies installation
fix(manager-gce): removed gsutil dependencies installation

As of late, the db node's comes with the gsutil dependencies pre-installed,
so I removed the installation from the test flow

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