Add exclusion line for CACHE

The following discussion from !711 (merged) should be addressed:

• @sstahl started a discussion:

  Are you interested in testing these values and that they don't change?

  If not, one could add an exclusion rule to the qmtest, see here https://gitlab.cern.ch/lhcb/Moore/-/blob/master/Hlt/Moore/python/Moore/qmtest/exclusions.py#L63

assigned to @pkoppenb

mentioned in merge request !711 (merged)

mentioned in merge request !738 (merged)

mentioned in commit 9f906874

closed with merge request !738 (merged)