upgrade to generator-jhipster v8 #665

Job	Run time
build-matrix	9s
ng-default	9m 56s
ng-default-additional	2m 50s
ng-mongodb-kafka-cucumber	9m 20s
ng-gradle-fr	9m 23s
ng-gradle-h2disk-ws-nocache	9m 24s
ng-webflux-mongodb	9m 22s
ng-webflux-gradle-mongodb-oauth2	9m 23s
ng-webflux-psql-default	9m 22s
ng-webflux-psql-additional	8m 59s
ng-webflux-gradle-session-h2mem-es	2m 17s
ms-ng-oauth2-mongodb-caffeine	9m 53s
mf-ng-eureka-jwt-psql-ehcache	9m 56s
ms-mf-ng-consul-oauth2-neo4j	9m 33s
check-angular	1s
	1h 49m 48s

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