Resubmit 'KS2pipimumuFiltered'

RDWG - Filtered MC Request for KS2pipimumu

See merge request !120 (merged)

(cherry picked from commit a86ae299)

68de0e9a Add stage 0 yaml for filtered request

Resubmitting due to: https://its.cern.ch/jira/browse/LHCBGAUSS-2828

Initial productions were 50% complete before cancellation ==> event sizes reduced by half.