Print polarity check warnings to log.
Add functionality for warning users when they only request a single polarity for a given bk_query. This will print warnings to both the CI log and (I think) the production log.
Helps resolve lbapcommon#6 (closed)
Depends on lbapcommon!32 (merged)
Yet more work on validation/monitoring, see the grand task https://gitlab.cern.ch/lhcb-dpa/project/-/issues/93.
Edited by Eduardo Rodrigues