[tabcmd] refactor: extract CSVImport._decompose_site_role, inverse of _evaluate_site_role - #1812

[tabcmd] refactor: extract CSVImport._decompose_site_role, inverse of _evaluate_site_role#1812

jacalata wants to merge 4 commits into

jac/csv-import-fixes-and-find-by-nametableau/server-client-python:jac/csv-import-fixes-and-find-by-namefrom

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