port `ScanCorrections` to be a plain functionality of `correction`

The following discussion from !194 (merged) should be addressed:

• @lmoureau started a discussion: (+3 comments)

  This reinvents correction summary | grep. Since upstream is responsive, I think they would accept a PR to output a simple list.

  If Core really needs to implement this feature, I think it should be a standalone command so it can be used for e.g. muons.

added changepatch statusto do typesoftware upstreamCMS labels

changed title from Follow-up from "trick to get JES variations in data rather than MC" to {+port ScanCorrections to be a plain functionality of correction+}