ENSCORESW-824: added SourceTypes healthchecks as part of the core healthchecks
for merged species, checks that each toplevel region has some genes of each source (ensembl, havana, ensembl_havana)
Automatic merging of dev into master

* dev:
  ENSCORESW-824: added SourceTypes healthchecks as part of the core healthchecks for merged species, checks that each toplevel region has some genes of each source (ensembl, havana, ensembl_havana)