* refactor(selectoptiontest): move helper function out of grafana/ui so testing-lib isn't in bundle
* test(selectoptionintest): update import location of helper function
* test(amroutes): put back missing selectOptionInTest helper
* test(selectoptionintest): clean up remaining file imports / exports
* test(queryeditor): fix failing import
* refactor(grafana-ui): reuse selectOptionInTest in SelectBase test
