Hbm 101 subtaxonomy support

make fresh
login as admin
rebuild tracking information in search api https://bnm.docker.so/admin/config/search/search-api/index/research_group
index search api
add a few level 3 taxonomy
add couples Research group content unit values
Check that taxonomy tree looks ok and correct
Check that those Research group content founds under level 3 taxonomy term
Check that export works and multiple values are string with , separator https://bnm.docker.so/content-import