refactor(rolling_upgrade): add catchError for getting base versions
refactor(rolling_upgrade): add catchError for getting base versions

This commit adds the catchError method for the rollingUpgradePipeline
script, getting base versions step. This should imrove debugging any
potential errors in that stage of the pipeline.

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