Include the SSPion/SSProton fix into the latest FT development
This MR introduces the SSPion/SSProton fix into FlavourTagging's gitlab-ci branch. This essentially turns the failing pipeline into a successful one, meaning that all taggers passed the "first line of defence" tests.
We still need to discuss an internal tag flip inside the SSKaonLatest tagger, which prevents TAGETAS > 0.5, but potentially changes the SSKaonLatest TAGETA distribution.